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August 13 - August 17, 2018

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

Selected Answers

From Edward Edrosa of Behr Process Corporation on August 16, 2018:
An effective alternative method would be to wipe the glossy surface with acetone and let it sit for about 10 seconds before wiping it off with a scouring pad. This only works on surfaces that have been painted with solvent-based coatings. The advantage of this method is no sanding dust is created. Another technique is to use a deglossing liquid (deglosser).

From Warren Brand of Chicago Corrosion Group on August 15, 2018:
We had a complex project a few years ago the solution for which was vapor blasting with aggregate. The only options here are mechanical abrasion, either with sandpaper, by hand (with other tools) or blasting of some type. If those are not possible, the only option is to treat the surface chemically to either soften the existing material, or provide a chemical etch or profile. Lastly, there are a small, select number of primers and other materials that have tenacious adhesion to glossy, untreated surfaces.

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Tagged categories: Asia Pacific; EMEA (Europe, Middle East and Africa); Good Technical Practice; Latin America; North America; Specification

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