Cracked RV Holding Tank Repair using G/Flex 655 Epoxy

The other day I purchased some West Systems G/Flex 655 Epoxy at a local boatyard marine supply shop to try and fix small cracks in my waste tanks. I’m hoping it’s going to be just the ticket.

Last year’s repair attempt using a product called Plasti-Mend didn’t hold up. After only a few months, the cracks returned. Over the course of our 6 months snowbird trip, I had to reapply several times to prevent leaks. 

In this video, I give you a look at the kit contents and my latest cracked waste tank repair attempt using the G/Flex 655 epoxy. Before and after the repair.

Cracked RV Waste Tank Repair Video

A toughened, versatile epoxy that is conveniently pre-thickened for permanent waterproof bonding of plastic, fiberglass, ceramics, metals, damp and difficult-to-bond woods. With a modulus of elasticity of 150,000 PSI, it is a bit more flexible than standard epoxies and polyester, but much stiffer than adhesive sealants. This gives G/flex 655 the ability to make structural bonds that can absorb the stress of expansion, contraction, shock, and vibration. It is ideal for bonding dissimilar materials. Mixed at a 1:1 ratio, G/flex 655 gives you 45 minutes of working time at 72°F. It reaches an initial cure in 7 to 10 hours and full cure in 24 hours.

West Systems website G/Flex 655 info page

West Systems Product Page on Amazon

Repairing a crack on an RV holding waste tank with West Systems GFlex 655 thickened Epoxy by Love Your RV

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