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Review on XFasten 8 Inch 30 Foot Sealing Patching RV Parts & Accessories by Joseph Long

Revainrating 5 out of 5

Long history of waterproof sealing.

Butyl rubber has a long history as a waterproof seal, and it works. The prerequisite is that it is held by a flange or other device. It never hardens, but rather spreads when squeezed. It will sag under its own weight as the piece lingers. So for boat fittings, screw heads, hatches etc. It's perfect. Unlike polyurethane and silicone sealants, it does not "harden" but remains flexible and removable.

Pros
  • Best in its niche
Cons
  • A few little things