Solarez Extreme is a mixture of our highest-strength resin, our Vinyl Ester Epoxy, fiber reinforced with both glass and ceramic fibers resin and an amazing solar-activated catalyst. It will remain liquid until exposed to direct sunlight. Simply apply it in the shade, then let sunlight hit it and in 3 minutes, you're done ( even @ -20°F). Truly amazing! Use this EXTREME STRENGTH formula on surfaces that demand extreme adhesion, toughness and / or corrosion resistance. Not for use on styrofoam EPS.