Keep in mind, it doesn’t have the elasticity of crack sealant rubber. What is it Used for? Ryan explains in the interview, that mastic has many uses. Great for patching over “spider-cracks ...

Permascreed is a new mastic asphalt screed from Permanite Asphalt which offers a speedy way to create drainage falls and a stable base for flat roof waterproofing systems and mastic asphalt car parks.