How do you prepare any surface for finishing to ensure adhesion?

• A. Clean, dry, free from dust, sand to 180-220; degloss; use grain-run; ensure dust removal.
• B. Wash with hot water and soap; air dry.
• C. Sand aggressively with 40 grit, then apply finish.
• D. Wipe with solvent only.

Answer: (A)

Preparing a surface for finishing means creating a clean, dry surface that the finish can form a good bond with. Start by removing oils, dirt, and any residues, and make sure the wood is completely dry. Then create a light mechanical key by sanding to a fine grit, typically around 180–220, so the finish has something to grip without leaving deep scratches. If the surface is shiny, dull it with deglosser or a light sanding so the finish can adhere rather than ride on a slick surface. After sanding, remove all dust completely—dust on the surface will ruin adhesion. If moisture or sanding raises the wood fibers, lightly re-sand to smooth the grain and wipe away the dust again. This combination of clean, dry, dust-free, lightly abraded, and deglossed surface provides the best foundation for the finish to adhere properly.