TRP #950 Eternamastic Elastomaric Roof Mastic is a tough, tenacious and durable white compound with high grade components. It was developed and is designed to be a superior reflective material for new roofing, re-roofing, and roof maintenance markets. TRP #950 Eternamastic Elastomaric Roof Mastic's high pigment level provides highly reflectivity, is easy to apply, and has superior hiding power. It has multiple application uses including on: Laps, Cracks, Seams, Directional Wall Changes, Screw Heads, and Roof Intrusions.