A unique combination of marine silicone and polyurethane formulated especially for fiberglass. LifeSeal offers a fast-curing, low odor, high adhesion, non-sagging, non-corrosive, non-yellowing formula. Custom colors available. Mildew resistant. It provides a durable permanent watertight seal for joints subject to structural movement. May be used above and below the waterline. Use for sealing decks to hulls, thru-hull fittings, vinyl ports, sealing/glazing windshields and bedding marine hardware. Will adhere to metal glass, wood, Lexan, ABS and certain other materials. Can be removed without damaging gel-coat. Not recommended for ferro cement hulls impregnated wood or oil-soaked materials. Cures in presence of water. Acid free.1170,1171,1169

Key features

  • Polyurethane and silicone formulated for use on fiberglass
  • Fast-curing, low-odor, high-adhesion, non-corrosive and non-sagging
  • Removable without damage to gel coats


  • Formulation: One-part polyurethane/silicone sealant 
  • Recommended Usage: Fiberglass, vinyl, ABS, Lexan, metal, glass, wood; Above or below water line 
  • Material Incompatibilities: Ferrocement hulls, impregnated wood, oil-soaked materials; Not paintable 
  • Adhesion Rating: Tensile; 290 psi; Elongation: 350%
  • Cure Time: Tack free: 20 min; Complete cure: 4-36 hrs. 
  • Cleanup: Soap and water 
  • Removal: Mechanical removal
Best Use Fiberglass
Not Paintable
Capacity 10.6 Ounce Cartridge
Color Clear
Cure Time 20 Minutes Tack-Free
4 to 36 Hours Full Cure
Type Polyurethane Sealant
Silicone Sealant

Customer Reviews