Products / Karnak 671 Karna-Seal

Karnak 671 Karna-Seal is a single-component, moisture curing, 100 percent silicone roof sealant. The maker lists it for repairs on roofs coated with 670HS Karna-Sil Ultra or other silicone coatings, and for seams, flashings, penetrations, fasteners, drains and scuppers on modified bitumen, metal, aged TPO and PVC, EPDM, spray polyurethane foam and concrete roofs. Its product page reports 92 percent solids by weight by ASTM D1644 and 273 percent initial elongation by ASTM D412, and lists it as Miami-Dade approved. It is white or black, sold in 2.5 gallon buckets, 2 liter pouches (white only) and 10.1 oz caulk tubes.