Tremco Water Block Sealant is a gray, high performance, low VOC, non-curing/non-skinning, permanently flexible gun grade sealants.  It maintains a positive seal by remaining flexible and adhered to all approved substrates including concrete, masonry, gypsum, metal, glass, plastic and wood surfaces.  It does not require a primer, provides excellent gunnability even at low temperatures and is water-resistant even if immersed.  It is designed for unexposed waterproofing applications and can be used behind termination bars, under roof drains, and as an acoustical sealant, roof panel rib sealant and vapor barrier sealant.  Tremco Water Block Sealant will typically be used in support of single ply systems.

Composition:

Tremco Water Block Sealant is a synthetic rubber that provides excellent adhesion to clean dry surfaces.  It should only be used in areas that are not exposed to sunlight.