Problem Solving Forum (161)


What measures must you take to determine and assure the cleanliness of an abrasive?


When should you specify UHP waterjetting on bridges?


The literature indicates that UHP waterjetting does produce a profile on steel, although of a micro nature. Is this sufficient roughness for good adhesion of thin film primers (e.g. < 2 mils dft)?


What are the pros and cons of using shotblasting to remove a coating system from a concrete floor?


When SSPC-SP3 (Power Tool Cleaning) is specified, how should one decide when to apply the power tool to the entire surface and when to use it just where the coating appears to be defective or rusting?


How do you determine if steel shot or grit for centrifugal/wheel blasting need to be replaced?


When a food plant runs 24/7, even during coating maintenance, tiny airborne food particles can contaminate a prepared surface. How do you identify, prevent and/or remove such contamination before coating?


What quality control checks can I use to assure the cleanliness of steel abrasive in a fabricator's or shipyard's shop?


How do you maintain a proper operating mix of recyclable abrasive in the field?


What is best media to use to remove aged epoxy coal tar from a steel tank before re-lining?


How do you assess salts and other non-visible contaminants on concrete surfaces?


What measures must be taken to determine and assure the cleanliness of an abrasive?


How do you remove all traces of an uncured internal coating from a tank when abrasive blasting is not an option?


Is grinding the only way to remove large areas of a silicone coating from a ship's hull to replace the silicone with an epoxy mastic?


When a specification calls for removal of only loose coating rather than complete coating removal from a masonry substrate, what surface preparation methods are most likely to work without damaging the intact coating that is left on the surface?


How should surface preparation be conducted in non-sparking atmospheres?


How does residue from chemical stripping affect the performance of the replacement coating?


When SSPC-SP 3 (Power Tool Cleaning) is specified, how should one decide when to apply the tool to the entire surface and when to use it just where the coating appears defective or rusting?


How much detail should be included in a specification for the surface preparation and painting of a parking garage exterior that includes tilt-up and structural concrete substrates?


What type of coating system (and surface prep) should be used to protect a steel factory roof that is subject to hydrochloric acid vapors and other industrial pollutants and particulates in a hot, humid environment?


What environmental and safety precautions need to be taken when removing lead-based paint from the brick on a commercial building adjacent to the sidewalk in a dense urban business district when the removal method is chemical stripping followed by water blasting?


How does abrasive recycling affect cleaning rates when steel is blast-cleaned in the field?


Which type of abrasive blasting media is suitable for preparing the more “exotic” stainless steels, such as Inconel or Monel?


I need to coat a bare concrete warehouse floor that has visible oil stains. What are my options for cleaning the concrete before coating it?


What causes static electricity during abrasive blasting? What risk does it pose, and how can it be controlled?


What is the proper surface preparation for stainless steel before coating to resist a salt-laden atmosphere?


What is the best low-maintenance approach to coating power-tool-cleaned field weld joints on process pipework that is protected with thermal-sprayed aluminum?


What pluses and minuses have you seen with using recycled-glass abrasives vs. traditional abrasives?


How pure must fresh water be for water washing or waterjetting, and how do you determine the water’s purity?


What is the best way to achieve proper surface preparation in areas with limited access, such as interior box beams on bridges?


How do you determine if local water is suitable for use in UHP waterjetting, particularly in areas where potable water is scarce?


We need to paint our publicly owned lighthouse. What should I include in the specifications for this bid regarding surface preparation, coating systems, and other considerations?


What are the pros and cons of using shotblasting to remove a coating system from a concrete floor?


How do you best remove lubricants and other contaminants from field-bolted connections prior to painting?


What is the function of an air receiver during blasting?


Under what types of exterior atmospheric exposures (other than marine) is it necessary to test for soluble salts?


How long after blasting can stainless steel be left before painting? If this time is exceeded, what further surface preparation is required?


What is the best method for preparing newly galvanized steel to be overcoated with an epoxy system?


What abrasive should be used to prepare stainless steel?


How do I prepare an oil-stained, bare concrete floor for coating?


When SSPC-SP3 (Power Tool Cleaning) is specified, how should one decide when to apply the tool to the entire surface and when to use it just where the coating appears defective or rusting?


What causes static electricity during abrasive blasting? What risk does it pose, and how can it be controlled?


When should you specify UHP waterjetting on bridges?


How can I determine the cleanliness of stainless steel for painting after blast cleaning?


There are ways to increase the pressure for waterjetting to levels above 20,000 psi. What are the effects of different pressures (below and above 20,000 psi) on cleaning ratios?


What causes a persistent green/yellow hue on steel that has been exposed for a number of years in close proximity to the ocean, and how should the steel be prepared for painting?


How do you abrasive-blast the interior surfaces of steel or ductile iron pipe scheduled to receive a high-build, high-performance protective lining system?


Can fluoropolymer coatings that are still very glossy be overcoated (if, for example, the topcoat is losing color or the color needs to be changed)? If so, what type of coating can be used, and what surface preparation is required?


How clean must the compressed-air supply be for blast cleaning, blow down and painting? How is cleanliness of the air determined?


What is the best way to remove thick-film elastomers from floors and ship decks?


Is grinding the only way to remove large areas of a silicone coating from a ship's hull to replace the silicone with an epoxy mastic?


How should surface preparation be conducted in non-sparking atmospheres?


How does abrasive recycling affect cleaning rates when steel is blast-cleaned in the field?


What kind of surface preparation prior to coating will be effective and at the same time economical for the aluminum window frames on a large commercial office building? The aluminum was coated originally with a baked-on fluoropolymer which has lost most of its gloss. Maintenance recoating will be with an air-dry fluoropolymer.


What coating or lining system, including surface preparation, should be used on an in-ground swimming pool constructed of galvanized steel in a northern climate?


Is it practical to use black light to check for dirt or other foreign matter during surface preparation inspection?


When coating an aged concrete floor, how should one determine the correct sequence of surface preparation among the options of pressure washing and grinding or other concrete removal and roughening methods?


Can fluoropolymer coatings that are still very glossy be overcoated (if, for example, the topcoat is losing color or the color needs to be changed)? If so, what type of coating can be used, and what surface preparation is required?


When planning containment for blasting, what are the most important factors to consider?


How do you prepare flame-cut edges for application of thermal spray metallic coatings? The problem is that these edges are often harder than the abrasive, so a very low profile is produced, resulting in lower-than-specified adhesion of the thermal spray to the steel.


When SSPC-SP3 (Power Tool Cleaning) is specified, how should one decide when to apply the tool to the entire surface and when to use it just where the coating appears defective or rusting?


What are the pros and cons of using shotblasting to remove a coating system from a concrete floor?


What are the alternatives for removing mildew from uncoated concrete block exteriors before coating?


What is best media to use to remove aged epoxy coal tar from a steel tank before re-lining?


What is the best method for removing fluorescent orange spray graffiti from a brick wall?


Your field surface preparation requires SSPC SP-10 and your field bolting uses hot-dip galvanized bolts. What surface preparation do you require/allow on and around the bolts?


How do you best remove lubricants and other contaminants from field-bolted connections prior to painting?


Animal fat in slaughterhouses often penetrates concrete surfaces. If the fat is not removed before the concrete is coated, the fat can cause the coating to fail. How do you identify and remove the contamination before coating the concrete?


What is the best way to remove thick film elastomers from floors and ship decks?


What criteria should an owner use to determine whether to specify full removal or spot- or zone-repair on a maintenance project?


I need to remove coatings from masonry on a historic-preservation project. What are my options for doing so without damaging the mortar joints?


What causes static electricity during abrasive blasting? What risk does it pose, and how can it be controlled?


What advantages/disadvantages have you seen with using recycled glass abrasives vs. traditional abrasives?


How pure must fresh water be for water washing or waterjetting, and how do you determine the water’s purity?


How long after blasting can stainless steel be left before painting? If this time is exceeded, what further surface preparation is required?


What are the pros and cons of specifying sieve sizes for abrasives?


How do you remove all traces of an uncured internal coating from a tank when abrasive blasting is not an option?


How do you strip paint from a cementitious substrate if you can’t alter the surface texture?


How long can a blasted surface be left before priming under different temperatures/relative humidity environments?


What is the proper surface preparation for stainless steel before coating to resist a salt-laden atmosphere?


How do you determine if local water is suitable for use in UHP waterjetting, particularly in areas where potable water is scarce?


What pluses and minuses have you seen with using recycled-glass abrasives vs. traditional abrasives?


What measures must be taken to determine and assure the cleanliness of an abrasive?


What is the best method for removing production machine oils soaked deeply into a concrete floor before applying a non-skid coating?


When refurbishing an old concrete secondary containment wall around a storage tank, what criteria should be used to determine if a crack can be repaired for coating or if the section of the wall should be rebuilt?


How pure must fresh water be for water washing or waterjetting, and how do you determine the water’s purity?


How long after blasting can stainless steel be left before painting? If this time is exceeded, what further surface preparation is required?


Which generic coating systems are suitable for protecting pipeline internals carrying highly abrasive media?


Are there special primers and surface preparation requirements for painting unpainted aluminum?


When should you specify UHP waterjetting on bridges?


Specifications often state that glossy surfaces must be dulled before overcoating. What are some methods for doing this, especially when sanding isn’t feasible?


I’ve heard that the use of the proper blast media is critical for the successful application of thermal spray aluminum and other metallics. What mechanism would lead to the differing performance characteristics of the TSA based on the blast media?


Under what conditions should you apply a resurfacing mortar to new, below-grade vertical concrete scheduled to receive a high-build, protective lining system for chemical containment or immersion service?


We need to paint our publicly owned lighthouse. What should I include in the specifications for this bid regarding surface preparation, coating systems, and other considerations?


I’ve heard about using crystalline admixture or crystalline materials on top of concrete to fill voids and make the substrate less permeable. When is this desirable, and what is the best way to use these materials?


When a specification calls for removing only loose coating from a masonry substrate, what methods are effective without damaging the intact coating that is left on the surface?


How to do you abrasive-blast the interior surfaces of steel or ductile iron pipe scheduled to receive a high-build, high-performance protective lining system?


How clean must the compressed-air supply be for blast cleaning, blow down and painting? How is cleanliness of the air determined?


Is grinding the only way to remove large areas of a silicone coating from a ship's hull to replace the silicone with an epoxy mastic?


How should surface preparation be conducted in non-sparking atmospheres?


What are the pros and cons of using shotblasting to remove a coating system from a concrete floor?


The literature indicates that UHP waterjetting produces a profile on steel, although of a micro nature. Is this sufficient roughness for good adhesion of thin-film primers?


Considering cost, productivity, and thoroughness, what is the best way to remove paint from cement blocks (CMUs)?


What is the clearest way to specify the degree of smoothness required by surface preparation on an exterior wood substrate covered with deteriorated and uneven layers of paint?


Do you need to wait for the mortar to cure before repainting a brick surface after repointing and power-tool cleaning? If so, how long, and how do you judge when it is safe?


When SSPC-SP3 (Power Tool Cleaning) is specified, how should one decide when to apply the tool to the entire surface and when to use it just where the coating appears defective or rusting?


How does residue from chemical stripping affect the performance of the replacement coating?


How should surface preparation be conducted in non-sparking atmospheres?


What kind of surface preparation is most effective and economical before recoating aluminum window frames on a large office building? The original baked-on fluoropolymer has lost most of its gloss.


How, besides grinding, can one remove large areas of silicone coating from a ship’s hull to replace the silicone with an epoxy mastic?


When animal fat in slaughterhouses penetrates concrete surfaces, how do you identify and remove the contamination before coating the concrete?


What is the best way to prepare a horizontal concrete surface for successful application of an acid stain?


What environmental and safety precautions must be taken when using chemical stripping and water blasting to remove lead-based paint from a commercial building exterior in an urban business district?


When a food plant runs 24/7, even during coating maintenance, tiny airborne food particles can contaminate a prepared surface. How do you identify, prevent and/or remove such contamination before coating?


What is the best way to remove thick-film elastomers from floors and ship decks?


What is the best method of testing for moisture content in concrete masonry unit (CMU) walls before application of coatings?


Which type of abrasive blasting media is suitable for preparing the more “exotic” stainless steels, such as Inconel or Monel?


I need to remove coatings from masonry on a historic-preservation project. What are my options for doing so without damaging the mortar joints?


Is it practical to use black light to check for dirt or other foreign matter during surface preparation inspection?


I need to coat a bare concrete warehouse floor that has visible oil stains. What are my options for cleaning the concrete before coating it?


There are ways to increase the pressure for waterjetting to levels above 20,000 psi. What are the effects of different pressures (below and above 20,000 psi) on cleaning ratios?


I keep reading references to sweep blasting, but I can't find a standard for it. What is sweep blasting, and is there a standard for it in the U.S. or elsewhere?


How do I prepare an oil-stained, bare concrete floor for coating?


What are the best practices for a small maintenance shipyard (120m x 20m x 8m drydock) to handle UHP-generated wastes?


What is the best low-maintenance approach to coating power-tool-cleaned field weld joints on process pipework that is protected with thermal-sprayed aluminum?


How do you prepare an oil-stained, bare concrete floor for coating?


Is there a place for using “rust convertors” in heavy-duty maintenance projects?


What is most effective treatment for steel contaminated with MIC before painting ?


How do you strip paint from a cementitious substrate if you can’t alter the surface texture?


Is it cost-effective to grind steel edges before coating for atmospheric service? Why or why not?


What causes static electricity during abrasive blasting? What risk does it pose, and how can it be controlled?


What is the proper surface preparation for stainless steel before coating to resist a salt-laden atmosphere?


How long after blasting can stainless steel be left before painting? If this time is exceeded, what further surface preparation is required?


What advantages/disadvantages have you seen with using recycled glass abrasives vs. traditional abrasives?


What are the pros and cons of specifying sieve sizes for abrasives?


When blasting cast-iron structural steelwork, what type of defects might be found, and how do you address them?


How do you remove all traces of an uncured internal coating from a tank when abrasive blasting is not an option?


What is the best way to achieve proper surface preparation in areas with limited access, such as interior box beams on bridges?


How long can a blasted surface be left before priming under different temperatures/relative humidity environments?


How do you determine if local water is suitable for use in UHP waterjetting, particularly in areas where potable water is scarce?


Some painting specifications call for the use of “Best Effort” in relation to blasting. How does one determine “Best Effort?”


What measures must you take to determine and assure the cleanliness of an abrasive?


Which generic coating systems are suitable for protecting pipeline internals carrying highly abrasive media?


When should you specify UHP waterjetting on bridges?


Specifications often state that glossy surfaces must be dulled before overcoating. What are some methods for doing this, especially when sanding isn’t feasible or desirable?


What is the remedial action if a blaster produces too high a surface profile for the required primer thickness?


What is the preferred method to remove 25-year-old coal tar epoxy from a carbon steel tank in order to reline?


When a specification calls for removal of only loose coating rather than complete coating removal from a masonry substrate, what surface preparation methods are most likely to work without damaging the intact coating that is left on the surface?


How does residue from chemical stripping affect the performance of the replacement coating?


When SSPC-SP3 (Power Tool Cleaning) is specified, how should one decide when to apply the power tool to the entire surface and when to use it just where the coating appears to be defective or rusting?


What are the pros and cons of using shotblasting to remove a coating system from a concrete floor?


How should surface preparation be conducted in non-sparking atmospheres?


How much detail should be included in a specification for the surface preparation and painting of a parking garage exterior that includes tilt-up and structural concrete substrates?


What is the clearest way to specify the degree of smoothness that you want to be achieved by surface preparation on an exterior wood substrate that is covered with deteriorated, uneven, and built-up layers of paint?


What quality control checks can I use to assure the cleanliness of steel abrasive in a fabricator's or shipyard's shop?


How do you maintain a proper operating mix of recyclable abrasive in the field?


What environmental and safety precautions need to be taken when removing lead-based paint from the brick on a commercial building adjacent to the sidewalk in a dense urban business district when the removal method is chemical stripping followed by water blasting?


What kind of surface preparation prior to coating will be effective and at the same time economical for the aluminum window frames on a large commercial office building? The aluminum was coated originally with a baked-on fluoropolymer which has lost most of its gloss. Maintenance recoating will be with an air-dry fluoropolymer.


What kind of coating system, including surface preparation, should be used to protect a steel factory roof that is subject to hydrochloric acid vapors and other industrial pollutants and particulates in a hot, humid environment?


What are the alternatives for removing mildew from previously uncoated concrete block exteriors before coating?


How can you justify the cost of installing an auto-blast machine and a paint booth in a fabricator's shop, and what resources are available to carry out such an analysis?


 
 
   

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