Roughen and clean the area to be repaired. Apply gloves to hands before handling product. Cut or twist off required amount. Mix by kneading with fingers to a uniform color. If mixing is difficult, warm Putty Patch to room temperature. Apply to surface to be repaired within 10 minutes of mixing. For best adhesion, force into any cracks or holes. For best results, use damp fingers for easier mixing, application and smoothing. Remove excess material before hardening begins. Putty Patch has a 25-minute work life. Functional cure is achieved in 60 minutes.