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Problem Solving Forum (61)


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?


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?


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


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?


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


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?


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?


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?


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 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?


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?


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?


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 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?


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?


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?


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 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 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?


 
 
   

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