I use West Systems’ G/Flex 655 thickened epoxy to repair hairline cracks in my RV waste tanks. This product is ideal because it doesn’t drip, has a low odor, and retains some flexibility.
First, I roughened it with a sanding stone on my Dremel tool and cleaned the tank surface really well. Then, I applied the mixed epoxy, utilizing fiberglass cloth between the layers to add strength to the repair. Previous repairs I made in the summer of 2019 still hold up well.
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