Skip Links

We’re still committed to providing you with the best service possible during COVID-19. Learn More

Varnish: How Many Coats?

Varnish Care, Gloss Varnish

The following coating schedule for applying varnish is offered as guidance, not gospel, but following it will nearly always yield a head-turning finish.

Coat 1 — Thin about 50% with the specified thinner. This is the sealer coat. Allow to dry overnight.

Coat 2 — Thin 20% with specified thinner. Do not sand sealer coat before applying coat 2. Let dry 24 hours.

Coat 3 — Thin 10%. Apply over coat 2 without sanding. Let dry 24 hours.

Coat 4 — Sand coat 3 lightly with 220-grit paper. Apply varnish full strength. Allow to dry over at least 2 nights.

Coats 5 & 6 — Same as coat 4 except sand between coats more heavily to "plane" the surface smooth. Flat surfaces may be sanded with an orbital sander.

Coats 7, 8, & 9 — Sand by hand with 320-grit paper between coats. Apply varnish full strength, taking extra care to avoid runs and sags. Allow each application to dry over at least 3 nights before overcoating.

Coats 1 through 6 can be your finish varnish or a less expensive formulation, but do not use hardware store varnish. General purpose varnishes are typically too brittle for marine use. In hot weather coats 4 through 9 may require a small amount of thinner to keep the brush from "dragging."


Don Casey

Contributor, BoatUS Magazine

Don Casey has been one of the most consulted experts on boat care and upgrades for 30 years, and is one of the BoatUS Magazine's panel of experts. He and his wife cruise aboard their 30-footer part of the year in the eastern Caribbean. His books include Don Casey's Complete Illustrated Sailboat Maintenance Manual, and the recently updated This Old Boat, the bible for do-it-yourself boaters.