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February 16 - February 20, 2015

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 Jaime Molina of Primary Materials Inc. on February 18, 2015:
A chemical treatment could re-emulsify the existing resin and destroy its bond to the concrete. If sanding isn't permitted, remove the original coat chemically before re-coating.

From Warren Brand of Chicago Corrosion Group on February 17, 2015:
There are two ways to address this. The first is sanding. If dry sanding is not an option, then I would look towards wet sanding. Otherwise, your only option is some type of chemical etching or application of a material (typically a solvent of some type) that will soften the existing material and allow the new product to adhere to the old.

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Tagged categories: Asia Pacific; EMEA (Europe, Middle East and Africa); Good Technical Practice; Latin America; North America; Sanding and hand tool cleaning; Surface preparation

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