Transtar Kwik Seal 2K Urethane Sealer Gray, 1Gallon, Hardener included. Kwik Seal 2K Urethane Sealer has been specifically formulated as a premium quality sealer to be used over a variety of substrates. Kwik Seal offers excellent adhesion to bare metal, aluminum, SMC, fiberglass, old paint finishes and all Transtar primers. Kwik Seal has excellent leveling and gloss hold out properties and is compatible with most basecoat/clearcoat and single stage systems. Mix Ratio 4:1:1, Hardener included. 6231