I cut one of the exhaust holes too big on the passenger side. I would like to big out the edge about an inch.

The body is made out of glass and vinyl ester resin, can I use glass mat and epoxy to build out the edge?

Example: https://www.autozone.com/sandpaper-a...it/1178018_0_0

Pic of exhaust hole with Pipes attached: Exhaust Hole.JPG

I'm a novice so trying to make sure this repair doesn't snap off in 3 months.

Thanks