- Q.I’m sealing an
exterior wood door. What is the best finish to
A. For a clear finish, apply at
least two coats of polyurethane to both sides and
all four edges of the door after it has been
beveled and planed to fit the opening. Most
important, seal the bottom of the door after it has
been cut and planed to fit.
If a painted finish is desired, apply the two
coats of polyurethane to seal the door, then coat
the door with a surface bonding agent, such as
Liquid Sandpaper (General Liquids Corp., P.O. Box
5867, Baltimore, MD 21208; 410/484-7222). This
agent is a deglosser that will allow the paint to
stick to the smooth polyurethane.