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Document record
This four-page application guideline covers the Envir-O-Sil coating system applied over single-ply roof membranes, with a last revision date of 9/18/25. The file notes that adhesion to single-ply substrates depends on the age and condition of each roof, and that field adhesion tests are highly recommended.
The product section lists Terminator 622, High Solids Silicone 412, Silicone Brush Grade 422, Acrylic Bonding Primer 905, spunbound polyester fabric and EcoCleaner 925. Terminator 622 is printed as a siliconized urethane sealant at 100% volume solids, in white or gray.
The primer stage requires two adhesion tests, using Acrylic Bonding Primer 905 and High Solids Silicone 412. If the silicone adheres, the file allows the coating to proceed; otherwise the surface is primed at 1 gallon per 200 square feet. Seams are flashed with Terminator 622 at 30 wet mils, and the file notes that heat-welded seams need no additional reinforcement.
Material changes / notes
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