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 ...

PITTSBURGH, April 10, 2025 /PRNewswire/ -- "I wanted to create a new device for storing silicone or mastic tubes," said an inventor, from Gundagai, NSW, Australia, "so I invented the P M DEVICE.