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Bridge Coating Systems: Selecting and Sourcing

The PaintSquare Guide to Surface preparation

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Problem Solving Forum (36)

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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?

Question posted August 25 to August 29, 2014


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?

Question posted August 25 to August 29, 2014


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

Question posted June 23 to June 27, 2014


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.

Question posted June 9 to June 13, 2014


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

Question posted June 2 to June 6, 2014


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

Question posted May 26 to May 30, 2014


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

Question posted May 12 to May 16, 2014


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?

Question posted April 7 to April 11, 2014


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

Question posted March 24 to March 28, 2014


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

Question posted March 17 to March 21, 2014


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

Question posted January 20 to January 24, 2014


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?

Question posted January 13 to January 18, 2014


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?

Question posted November 4 to November 8, 2013


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

Question posted October 21 to October 25, 2013


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

Question posted August 26 to September 1, 2013


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

Question posted April 22 to April 28, 2013


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

Question posted March 18 to March 24, 2013


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

Question posted November 12 to November 18, 2012


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

Question posted November 12 to November 18, 2012


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

Question posted October 29 to November 4, 2012


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

Question posted September 3 to September 9, 2012


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

Question posted August 20 to August 26, 2012


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

Question posted June 18 to June 24, 2012


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

Question posted June 4 to June 8, 2012


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

Question posted May 14 to May 20, 2012


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

Question posted April 16 to April 22, 2012


When should you specify UHP waterjetting on bridges?

Question posted October 17 to October 23, 2011


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?

Question posted August 29 to September 4, 2011


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

Question posted July 18 to July 24, 2011


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?

Question posted May 23 to May 29, 2011


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

Question posted January 17 to January 23, 2011


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?

Question posted December 13 to December 19, 2010


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?

Question posted November 29 to December 5, 2010


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.

Question posted September 14 to September 19, 2010


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?

Question posted September 7 to September 12, 2010


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

Question posted August 30 to September 7, 2010


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Clemco Industries Corp.
Powerful Protection in a Small Package

Mounts inside blast helmet, alerts operator to dangerous breathing-air condition by audible, visual, and vibratory alarms. Easily calibrated, battery operated.


LS Industries
LS Blasters: Optimum Steel Cleaning Efficiency

Simplify surface prep with the precise shot control of LS Blasters. Our blast technology delivers optimum coverage and finish. 800-533-8008


CS Unitec
Surface Prep & Material Removal

CS Unitec’s Floor Planers remove coatings & corrosion from concrete & metal surfaces. Produce keyed profiles for waterproofing applications. info@csunitec.com


Van Air Systems
Moisture problems in your air lines?

Van Air Systems' Blast Pak is a portable compressed air drying system that reduces downtime in all blasting and coating applications.


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Hurricane Vacuums
& Dust Collectors

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IndustrialVacuum.com


Novatek Corporation
Dustless Coatings Removal

Strip it, clean it, and profile it,
all dust free! High production
rates and Blast like finishes.
Comply with new lead
standards.


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