I have used Marine Tex many times to repair holes that I have carelessly allowed branches to punch into the fiberglass sheeting on my Warrior.
I first used this product decades ago on a boat.
This is a 2 part epoxy - comes in white & gray. The white is what I use. It is easy to use and when boondocking it is not so easy to find.
Just restocked -found some on Amazon - this is my 2nd order from this vendor. they shipped on time no hassle the first time.
Marine-Tex RM305K Marine-Tex - White, 2 oz.
Sold by: Shorts Marine Discount Parts
$12.79
Condition: New