Mapei Ultrabond ECO 420 Professional Outdoor Carpet Adhesive 946 mL

Ultrabond ECO 420 Professional Outdoor Carpet Adhesive is a moisture-resistant indoor and outdoor carpet adhesive. It is for indoor and outdoor carpet, smooth or rough-backed, including rubber, polypropylene and closed-cell urethane foam backings. A 946 mL pail is roughly 21 to 24 sq ft with a 1/8" U-notch, smooth-backed carpet. Flash 0 minutes over porous and 20 over non-porous. Working time 20 to 30 minutes over porous, 10 to 20 over non-porous. The carpet goes into wet adhesive over a porous substrate. Mapei give no MVER figure on this sheet. Ambient humidity 20 to 80%. Light traffic at 24 hours and heavy at 72. Approved substrates are exterior and marine-grade plywood, pressure-treated lumber, cured asphalt paving, exterior patching products, and concrete cured 28 days. Not on asphalt roofing. Not for solid vinyl or vinyl-backed carpet. Not over asbestos or any adhesive residue including cutback. This is the one in the range rated for outdoor use. Note the 2010 sheet prohibited pressure-treated lumber and the current 2023 sheet approves it, so an older copy will tell you the opposite. On the shelf in Mississauga and Barrie if you are picking up tile anyway.