The benefits of KARNAK's 671 Karna-Seal silicone sealant

By KARNAK.

When repair and maintenance are needed on an existing silicone coated roof, 671 Karna-Seal is the product of choice!

671 Karna-Seal is a single-component, moisture curing, 100% silicone roof sealant that offers excellent UV resistance, flexibility and tensile strength that resists weathering, hardening, chalking and cracking. 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. 671 Karna-Seal also offers excellent adhesion to modified bitumen membranes, metal, *aged single-ply membranes (TPO & PVC ), EPDM, Spray Polyurethane Foam and concrete.     

 * TPO and PVC membranes should at least be 4 years old before using this product. 

Features, benefits and 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 

Why use silicone roof sealant?

Silicone roof sealants are quickly gaining popularity for addressing roof repairs. One reason is silicone’s use as a roof coating has been strong over the past decade and continues to gain popularity. As silicone coated roofs age, maintenance is needed. For sealing penetrations, detailing new flashing curbs and general repairs, understanding what sealants are compatible is extremely important. As of this writing, the only sealant that is fully compatible and recommended for use over silicone coated roofs is a silicone sealant. Other sealants or flashing cement commonly used in the roofing industry will not adhere to silicone. Although you may have doubted the saying “only silicone will stick to silicone”, it happens to be true. The need for a compatible sealant to maintain and repair existing silicone coated roofs has been one of the forces driving the popularity of silicone sealants in the market.  

Silicone sealant has many unique properties making it advantageous to use on any roof. One is its ability to bond to several different roof substrates. Another is its ability to resist ponding water. Other benefits of silicone sealant include good elongation, long-term durability and resistance to UV degradation. This means the sealant will not chalk from exposure and is resistant to ozone, aging, weather and extreme temperatures. Not many sealants can claim these attributes. 

More than just a sealant, 671 Karna-Seal is a solution for your everyday repair and maintenance needs as well as for sealing existing silicone coated roofs. For more information about 671 Karna-Seal reach out to a local representative or contact KARNAK at 800.526.4236 or info@karnakcorp.com.