Mule-Hide Blog

New Seal-Fast® Liqui-Flash designed for challenging applications

Posted: 3/16/2021

New Seal-Fast® Liqui-Flash polyurethane roofing sealant from Mule-Hide Products Co. Inc. seals complex details quickly and permanently.


Easy to use and providing excellent adhesion, elongation and tensile strength, Seal-Fast Liqui-Flash is an exceptionally versatile maintenance and repair solution. The one-component, 100-percent solids, non-shrink, polyurethane sealant can be used in typical and difficult-to-access applications, including flashings, skylights, pitch pockets (filling and sealing), inlaid gutters, air conditioners, brick ties, roof vents, penetrations, ductwork, roof hatches, chimneys and seams. It is compatible with a wide range of substrates, including metal, polyurethane foam, aged smooth asphalt, aged modified bitumen, aged PVC and aged EPDM.


It may be used on TPO roofing systems when primed with Mule-Hide Si TPO Primer. It is compatible with Mule-Hide Products acrylic and silicone roof coatings. It is an ideal choice for repairing hail-damaged polyurethane foam roofs.


Seal-Fast Liqui-Flash goes on in one step using a brush or a ribbon nozzle. It requires minimal tooling but is viscous enough to prevent running and drain-out. It is semi-self-leveling, allowing it to be used for sealing and repairing single-ply membranes at any slope. Fabric reinforcement is not required for repairs. No stirring is needed.


Seal-Fast Liqui-Flash is available in three colors – black, white and gray. It is packaged in 10-ounce caulk tubes, 20-ounce sausage tubes, 1-gallon pails, and 3.5-gallon pails.

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