Stains & Finishes
Clear Coat
Varathane
$14-$35/qt

Spar Urethane Marine-Grade Clear Coat for Outdoor Wood

Spar urethane is a premium exterior clear coat originally developed for wooden spars of sailing vessels. This marine-grade finish contains UV absorbers and offers exceptional flexibility allowing it to expand and contract through extreme temperature and humidity changes without cracking or peeling.

Key Features

  • Marine-grade UV protection
  • Maximum flexibility
  • Waterproof finish
  • UV absorbers and blockers
  • Resists salt spray and moisture
  • Oil and water-based available

Specifications

Coverage: 100-125 sq ft/qt | Dry: 2-6 hrs | Recoat: 4-8 hrs | Apply: brush or spray | Coats: 3-5 | Cleanup: mineral spirits or water

Best For

Entry doors outdoor furniture boat trim window boxes pergolas and any exterior wood receiving heavy sun and weather exposure.

Compatible Materials

Hardwood
Softwood
Cedar
Teak
Mahogany
Marine-grade plywood

Pros & Cons

Pros

  • ✓ Superior UV protection
  • ✓ Extremely flexible finish
  • ✓ Marine-grade durability
  • ✓ Excellent water resistance
  • ✓ Beautiful gloss finish

Cons

  • ✗ Softer than interior polyurethane
  • ✗ Can yellow over time
  • ✗ Requires more frequent maintenance
  • ✗ Slower cure than lacquer
  • ✗ Higher cost per quart

Installation Tips

Apply thin coats with high-quality natural bristle brush. Sand 220-320 grit between coats. Apply minimum 3 coats adding extra on sun-exposed surfaces. Best applied at 50-80F.

Frequently Asked Questions