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Wood Magazine

5 ideal applications for sanding sealer

 

Plastic being pulled away from knot hole
Seal knots for a better bond

Resins in pine and the oily surfaces of some exotic woods, such as teak, prevent film finishes, such as polyurethane, from bonding with the wood. When that happens, the top coat can separate as it did on the strip of tape shown. However, a thin coat of shellac, like the one on slide one, seals in resins and oils to provide better grip for topcoats. (To choose the appropriate shellac, see the Shop Tip on the last slide.)

Polish Your Shellac Skills
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Wood Magazine