5 Gallon Maximum Stretch. 25% rubber 75% acrylic elastomeric roof coating. Up to 750% elongation. Up to 98% reflective surface that reduces heat in the summer months. Used on metal, tar, tar & gravel, built up, rolled roofing, and many other surfaces. Can be used on EPDM, concrete, and TPO roofs if Super Primer is applied first. May be used as a roof system with Super Elasto-Barrier over old tar flat roofs, tar & gravel, built-up, rolled roofing, EPDM, concrete, and TPO.Easy to apply with brush, roller or sprayer.