SikaBiresin AP077 + BPO Cream Hardener - White - Quart. Features:. Gelcoat repair system. Easy to apply - Easy to sand. High heat-resistance of 400F (209C). Accepts virtually all types of finishes. Low moisture absorption for above or below the waterline applications. Minimal shrink or sink upon cure. Bonds to epoxy, vinyl ester, polyester, and many substrates. Quick-set cure and finishing time. WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.