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Technical Note #3 - Coating Rejection

Rejection, commonly known, as Silicon Effect is a pullback of a coating applied to a substrate.

Rejection of coatings on floor surfaces is typically caused by contaminants.

The most common contaminants are: Aerosol sprays Silicones Contaminated equipment Concrete Curing Compounds Floor cleaning products

Unfortunately, in most cases, it is not possible to predict rejection on a floor before the coating application. Signs of rejection normally occur after application of the first or second coat during the initial drying process and the evaporation of the solvent.

The removal of contaminants from the floor before the coating application is critically important. Even when a floor has been cleaned and is free of rejection, a high concentration of certain contaminants remaining on the floor may weaken the bond between the coats and later cause delamination.

Throw away contaminated equipment like sandpaper, screen backs, or rollers. This prevents further contaminants from being transferred. Sanding can spread contamination across the floor.