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Question posted - December 15 to December 22, 2014:

What is best way to remedy over-thickness of a topcoat after it has dried and cured?

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Selected Answers

From Rodney White of Benjamin Moore & Company on December 19, 2014:
The first-response answer would be "it depends." It depends on what the substrate is, what type of coating it is, whether the coating is grossly over-applied or simply a bit beyond its recommended max thickness, whether the coating is in service in a critical exposure, and whether there is a detrimental result of the over-thickness.

For example, a corridor wall that has received 6 mils DFT of an acrylic enamel instead of the recommended 3 mils DFT would be well-served by testing an inconspicuous area for adhesion, film defects, etc., and if all seems well, leave it alone.

On the other hand, if the application is in, say, a municipal water supply tank, and the epoxy intermediate coat is over-applied to the point of curtaining, then obviously it should be removed and re-applied. There are literally countless situations in between, so we're back to the original "it depends" response.

From garrett bilsborough of custom concrete concepts on December 18, 2014:
When the over-thick coating is applied to concrete, a large block sander works great -- just like in the automotive industry, only on a much, much larger scale.

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Tagged categories: Coating / Film thickness; Topcoats

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