I used masking tape in back. This 3m repair is A epoxy, its light, just needs tooth to work. So rough edge with some 60 grit is fine. This sands like a dream . I use the 2 part container in my 3m gun. This costs, but you get a perfect mix every time.
I start with 80 grit on a DA sander, put on another coat to fill in any needed areas, then use 120. I wait 2 hours before sanding anyway. This stuff shapes extremely well. You will need to block the primer and make sure the rubber is bare around repair. SPI epoxy is what you want.
Last edited by Formulabruce; 06-18-2021 at 07:56 PM.
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