Problem Solving Forum (117)


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


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?


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


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 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 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?


When a food plant runs 24/7 even during coating maintenance, tiny food particles floating in the air (e.g., sugar from sugar processing) in the plant can contaminate a prepared surface. How do you prevent such contamination, or identify it and remove it before applying the coating?


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.


Can you provide recommendations on ways to make sure an acid stain can be successfully applied to an existing horizontal concrete surface? I understand that residues such as coatings, curing agents, waxes, or other materials will interfere with the stain’s reaction with the concrete, but can I find out what the substances are so I know how to remove them?


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


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


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


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


A specification for a bridge to be built of high-performance weathering steel requires an SSPC-SP 10, a profile of 3 to 5 mils, and metallizing with a final DFT of 10-12 mils. What challenges, time, and costs are associated with obtaining the profile?


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?


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


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?


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


How many areas should be tested for possible chloride contamination during fabrication of an offshore production platform, and why?


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?


How do you determine whether a lead-bearing coating can be overcoated or must be removed and replaced?


When should you specify UHP waterjetting on bridges?


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


How do you account for the profile of blasted steel when taking a dry film thickness reading?


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?


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?


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?


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?


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


In preparing for coating, what is the best way to treat a steel surface that has been attacked by microbiologically influenced corrosion (MIC)?


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


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 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?


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?


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


When should you specify UHP waterjetting on bridges?


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?


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?


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?


A specification for a bridge to be built of high-performance weathering steel requires an SSPC-SP 10, a profile of 3 to 5 mils, and metallizing with a final DFT of 10-12 mils. What challenges, time, and costs are associated with obtaining the profile?


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?


When performing maintenance surveys on structures that require coatings under insulation, how do you inspect the condition of the coatings?


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?


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?


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


What kind of initial treatment is the best defense against graffiti for rough-surfaced concrete block (CMU)?


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?


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?


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?


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 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 ?


Is it cost-effective to pressure wash a bridge or other structure before abrasive blasting? What pressures, flow rates, and procedures are recommended?


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?


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


In preparing for coating, what is the best way to treat a steel surface that has been attacked by microbiologically influenced corrosion (MIC)?


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?


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


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?


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


What are the options for shop-applied systems (surface preparation and coating type) to protect the interiors and exteriors of new saltwater storage tanks and associated steelwork that will be exposed to seawater, and that will allow for easy touchup and maintenance once the structures are erected?


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?


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


 
 
   

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