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 In Finishing, Shop Blog

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corns on sandpaper

Wet/dry sandpaper with lots of corns.

I was visiting a painter friend recently at a house where he was spraying lacquer on kitchen cabinets. I noticed many sheets of used sandpaper lying around with numerous “corns” embedded in each. A corn is the name used to describe little pieces of finish (or paint) stuck to sandpaper. This got me thinking of ways to avoid corns because they can seriously impede efficiency, not to mention increase cost because of all the sandpaper that is wasted.

Corns are finish that has been melted by the heat created during sanding, and they are large enough to leave much deeper scratches in the finish than those created by the sanding grit. These scratches will then have to be sanded out to keep them from telegraphing through the next coat, or detracting from the appearance in the final coat.

(All finishes should be sanded at least once, usually after the first coat, to remove the roughness and create a smoother final result.)



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