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Exterior Marine Spar Varnish


Exterior Marine Spar Varnish is formulated to withstand harsh seasonal cycles, environmental fluctuations and wet environments.

This finish requires timely maintenance to protect the wood and is an excellent choice for brightwork on boats.

The combination of UV guards, fungicide, Polymerized Tung Oil, and high-quality phenolic resin in Sutherland Welles Exterior Marine Spar Varnish make this an exceptional exterior tung oil finish for a durable and spectacular high gloss finish.

Looking for larger quantities?

We offer 5 Gallon Pails made to order at a 15% discount off the gallon price (Marine Spar Varnish: $637.29). Please call us at 1-800-322-1245 to order.

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Our Exterior Polymerized Tung Oil in the formulation gives the finish elasticity, helping our Exterior Marine Spar Varnish to protect the surface from the expansion and contraction cycles the finish goes through in different daily and seasonal exposures.

The process of applying Sutherland Welles Marine Spar Varnish begins with two coats of Exterior Polymerized Tung Oil Sealer as a penetrating primer.

This becomes the anchor to the flexibility of the Varnish. In the third coat, mix some Exterior Sealer with some Spar Varnish (50% sealer, 50% spar) and then subsequent coats are full strength Spar Varnish. It’s important to apply multiple, thin coats and allow adequate time in between coats for curing. Lack of through dry on a Varnish coat is often the most significant issue that causes quick coating failure.

Product Stats

Solid: Polymerized Tung Oil, Phenolic Resin
Solvent: Refined Mineral Spirits
Average Finish Longevity: 1-3 years
Spot Repairable: No
Sheen: Gloss sheen only
Coverage: (per gallon)
Coat 1= 600sqf
Coat 2= 800sqf
Coat 3= 1,000sqf
Coat 4= 1,000sqf
Dry Time: 12-24 hours per coat.


  • wood species
  • applications method
  • weather conditions 55-75ºF
  • temperature change during curing process
  • humidity 65% or less

Best Used For:

Exterior Staining
Fly Rods
Exterior Truck Beds

SDS Sheets

Exterior Marine Spar Varnish

Additional information

Weight N/A
Dimensions N/A

Pint, Quart, Gallon