Alvin Products rubber in a can is used to solve thousands of repairs. For plumbing and HVAC applications, rubber in a can is used to seal, protect and repair any surface including metal, PVC, concrete and rigid plastics. Rubber in a can is used by plumbers and HVAC contractors all over the world. Rubber in a can flows into cracks and holes which creates a tight rubber surface and dries to a flexible rubberized watertight coating. Rubber in a can is used on duct work, hvac equipment and exposed metal to protect against water leaks and penetration.