DC-315 Is an interior ignition or thermal barrier coating for polyurethane spray foam insulation. Depending on your particular application, an ignition thermal barrier is required by the Building Code. DC-315 is a water based latex system that dries quickly and reaches maximum properties in less than 14 days. Requires an airless sprayer with a minimum of 1 GPM or 3300 PSI and a tip size between 525 and 529. Ignition Barrier Coverage: 450 Sq Ft Per 5 Gallons at 12 Mils Thick Wet (or 12 Mils Thick Dry)