2torial #0549: Learn2 Varnish a Wood Surface (Continued) Select the proper varnish   Most varnishes are alkyd, and those containing tung oil are more water-retardant than those with linseed oil. Alkyd is not as unyielding as polyurethane and often more attractive. It is the best choice for fine wood pieces. Polyurethane is best used on "everyday" pieces that take a real beating. Drying time is fast (4 hrs. instead of the usual 24) and you don't need to go back and level your brush strokes. But by providing such a truly solid layer, polyurethane more resembles plastic than wood: avoid using it on fine wood. Polyurethane varnish is so tough it often requires an electric sander to remove. Use phenolic resin or spar varnish for outside work or for boats. These varnishes are too thick and will yellow too much over time for fine wood or interior work. Step 2