Mar-Hyde® Ultimate® 2K Primer Surfacer brings the "ultimate" performance characteristics to the repair process with its fast drying, high build, excellent adhesion, and easy sanding properties. Designed for any size repair, this high quality primer-surfacer can be applied over properly prepared steel, aluminum, iron, fiberglass and previously painted surfaces and can be topcoated with any automotive paint system. Mixing ratio of 4:1:1 results in ready-to-spray VOC of 4.3 lb/gal. USEPA National Rule compliant.