Forms a permanent waterproofing air/vapor seal around doors and windows that prevents air and moisture leaks; stop moisture intrusion that causes black mold; no special tools needed, peel and stick installation; meets or exceeds all building codes including ASTM 2112; passed hurricane level windblown rain test ASTM E331-90; adheres to vinyl, plywood, OSB, foam, metal, aluminum and masonry; can be left exposed up to 120 days.