The Big Dictionary of Dreams

by Martha Clarke
Dreaming of varnishing furniture, a door, or any object is a sign that there is something you want to keep secret. Frequently, it refers to defects, shortcomings, or attitudes that do not make you proud. There is something in the self that you do not fully accept and, therefore, you cover it with layers of varnish.

Encyclopedia of Dreams

by Michael and Elizabeth Thiessen
When you dream you see someone varnishing furniture this denotes a loss to you from friends who work for their own gain.

If you are doing the varnishing then it shows you will win the battle but lose the war because you used less then honest tactics in your endeavor.

New American Dream Dictionary

by Joan Seaman - Tom Philbin
1. Superficial or cosmetic enhancements will not fix deep structural problems, possibly in character.

2. Feelings of having been deceived.

3. Hard work and endurance bring re­wards.

4. A bad omen regarding the truthfulness of matters and self-deception.