670HS Karna-Sil Ultra (High Solids, Low VOC Silicone Coating)

DESCRIPTION: 670HS Karna-Sil Ultra is a white, single component, high solids, moisture curing silicone coating that produces a durable elastic coating with exceptional weathering and water resistance characteristics. USES: Newly Sprayed Polyurethane Foam or Previously Coated Silicone roofs (no primer required); metal, concrete, masonry, TPO, PVC, Hypalon, and EPDM roofs (requires 180 Karna-Sil Ultra Epoxy Primer); BUR (Built-Up) and Modified Bitumen (requires 180 Karna-Sil Ultra Epoxy Primer or 405 Bond-N-Shield Base Coat). BUR surfaces must be allow to age a minimum of 90 days. SBS and APP granular modified membranes and smooth surface APP membranes must be allowed to weathered a minimum of 30 days as well as new metal roofs. 670HS may be used on vertical as well as horizontal applications. All surfaces must have positive drainage. Note: Vertical application may require multiple coats to achieve desired film thickness. APPLICATION: 670HS Karna-Sil Ultra should be applied in a single coat application at the required application rate. If additional coats are to be applied, allow previous coat to cure 2-8 hours (dependent upon temperature and humidity) before applying subsequent coat. Subsequent coats should be applied within 24 hours of previous application to ensure uniform adhesion. Applied coating film should be even and free of pinholes. Coverage will vary depending on the surface to be coated. To improve aesthetics, impact resistance and toughness of the coating, ceramic roofing granules should be applied immediately into the final coat after application. Back-roll granules into coating and allow to cure then blow off or sweep loose granules from the surface. Mix coating prior to application with a 3” diameter mixer (5-gallon pail) or 6” diameter mixer (50 gallon drum). Once product is mixed, the entire container should be used. 670HS Karna-Sil Ultra may be applied by brush, roller or airless spray equipment. Apply at temperatures 50°F to 120°F. Do not apply if rain is expected within 24 hours after application. Commencement of work by the contractor implies their approval of the roof surface. | DESCRIPTION: 671 Karna-Seal is a single-component, moisture curing, 100% silicone roof sealant that offers excellent UV resistance, flexibility & tensile strength. 671 Karna-Seal resists weathering, hardening, chalking & cracking. USES: 671 Karna-Seal is intended to be used to make repairs to roof substrates previously coated with 670HS Karna-Sil Ultra silicone or silicone coating by others. The sealant also offers excellent adhesion to modified bitumen membranes, metal, *aged single-ply membranes (TPO & PVC), EPDM, Spray Polyurethane Foam & concrete roofs for making repairs to seams, flashings, penetrations, fasteners, drains & scuppers. FEATURES, BENEFITS & ADVANTAGES: 1. Resists permanent ponding water 2. Application by brush 3. Bonds to several different roof substrates 4. Low VOC, low odor 5. For horizontal and vertical use, will not sag 6. Rain safe in one (1) hour 7. Ready to use, no mixing of components 8. UV stable, may be left exposed 9. Excellent weather resistance & durability SURFACE PREPARATIONS: All surfaces to be sealed must be clean, dry, and free from oil, grease, and other foreign matter. Recommended application temperature is 50°F to 120°F. If necessary, wipe the surface with denatured alcohol or other oil-free solvents just prior to using. Perform an adhesion test if unsure of application. APPLICATION: 671 Karna-Seal is ready to use from the container. Apply using a brush, trowel or bulk loading caulk gun. For cracks and joints, apply over a clean substrate in a 1/16” to 1/8” thickness then immediately embed 5540 Resat-Mat or 3036 Poly-Mat fabric into the wet sealant. Smooth out fabric then apply another layer of sealant. The sealant begins to cure as soon as it is exposed to air. When applied at a 1/8” thickness, the sealant will skin over in approximately 5-10 minutes and cure fully in 24 hours (@ 77°F and 50% relative humidity). Not intended for application to below grade substrates or those continuously under water submersion. Discoloration and poor adhesion may result where applied over substrates that bleed asphalt, oils, plasticizers, or solvents including treated wood, vulcanized rubber and oil-based caulks. Not intended to be painted over except with 670HS Karna-Sil Ultra silicone coating, when properly prepared. COVERAGE RATE: 671 Karna-Seal is typically applied in a 1/16” to 1/8” thickness depending upon the substrate, which equates a coverage rate of 4 to 8 gallons per 100 sq. ft. Coverage Rates with Fabric Reinforcement: Approximate Fabric Width 4" 6"" If Mastic Applied at 1/16"" thick