Restoration Shop 2.1 VOC High Solids Urethane Primer Gallon Kit with Hardener Our Restoration Shop High Gloss Urethane Primer is formulated at less than 2.1 VOC, designed to offer superior fill, productive dry time, ease of sanding, and excellent adhesion. This is a two-component urethane system with a 4:1 Mix Ratio This primer is VOC compliant 1 - Gallon of Restoration Shop LOW VOC HIGH SOLIDS PRIMER (RP 2100) 1 - Quart of Urethane Hardener (RH 4201)