885 Tropi-Cool Silicone Roof Sealant

Henry 885 Tropi-Cool is a 100% silicone Wet Patch roof leak repair sealant. It is a high solids dispersion of 100% silicone, supplied white, and the data sheet is dated 06/08/2023. It is a one-component, moisture-curing, solvent-free sealant and is applied by trowel. It sits in the Henry roof coatings and sealants range for roof restoration and repair. As a roof repair sealant, it can be used in damp, wet and dry conditions.

• Appearance: white; color: bright white.
• Maximum VOC: 25 g/l.
• Solids content by volume: 95% +/-3.
• Application temperature: 35 F (2 C) and rising.
• Tack-free time: 1 to 3 hours in the property table, and about 1 to 2 hours in the application text.
• Cure time: 12 to 18 hours in the property table; fully cured in about 48 hours depending on temperature and humidity.
• Elongation at break: 275% minimum (ASTM D412).
• Tensile strength: 130 minimum (ASTM D412).
• Unopened shelf life: 24 months.

The sealant is listed as UV resistant with no hardening, chalking, crazing or cracking, and as mold and mildew resistant. It is ponding water resistant and bonds to a wide variety of building materials on vertical and horizontal surfaces. Application works under water or in driving rain. The application range is 35 F to 120 F (2 C to 49 C).

The sealant is used on existing asphalt roofs, including built-up roofing (BUR) and modified bitumen (MB), aged single-ply roofs, spray polyurethane foam (SPF) roofs, metal roofs, concrete roofs, previously coated roofs, and RV, trailer and mobile home roofs. It is also used on flashing, fasteners and drains.

The surface is clean and free of dust, rust, residue and contaminants such as chalk, grease and wax. Rust and scale are removed from metal by wire brushing, the area is swept, and accumulated residue in low areas is scrubbed with detergent and rinsed. The surface is frost-free. Adhesion is tested on each different substrate by applying sealant, letting it cure and pulling one end.

• The sealant is ready to use and is not mixed or thinned.
• Cracks, breaks, tears and holes are repaired by applying the sealant 1/8 inch to 1/4 inch thick with a trowel or putty knife.
• The sealant is worked into the crack or break and spread 2 inches to 4 inches beyond, with the edges feathered.
• It can be applied over old silicone coating or sealant that has cured.
• Voids left in the patch are filled with more sealant, which cures before coating.
• Application below 35 F (2 C) is not recommended. If a high volume of moving water is expected within 1 hour of application, additional thickness may be required, and the area is inspected after the water event.

Coverage is approximately 12 square feet per gallon applied 1/8 inch thick, or approximately 6 square feet per gallon applied 1/4 inch thick. The product size is 1 gallon. The container is packaged to keep latent moisture from starting the cure early. A skin that forms on exposed sealant is removed and the rest is used. Tools are cleaned with mineral spirits before the sealant cures, and hands with waterless hand cleaner.

The sheet carries a warning for skin and eye irritation, and the product is for exterior use only. It is stored out of the weather in its original, tightly sealed container. Henry's limited warranty provides replacement of product proved to have a material defect during the life of the existing roof, provided it was applied in accordance with Henry's written directions and proof of purchase is provided. The warranty is void if the product is coated over, patched, painted or covered with any product other than this product or approved products. Unopened containers may be returned within 30 days of purchase for a refund.