Update on Science project
Well Fiberglass resin and cloth is definitely not the way to go even in between layers of Hypalon fabric. I had to take it off and sanded down the fiberglass with my Dremmel tool. I still have some small leaks from the patches, so now I am using plan B.
I am using windshield adhesive to cover the seams and then applying the Hypalon fabric patch over the whole patch area with generous overage allowance. and then applying windshield adhesive over the seams of the exterior patch. After allowing generous time for the glue to cure, the
Avon R340 lives again, no leaks around my patch area, but definitely a very small leak(s) somewhere in the bow section that I can not find. I have replaced the B7 valve and tested it. I have sprayed the whole bow section may times with my homemade leak detection brew of Dawn dish washing liquid and water. I can not find this mystery leak(s). For now, it is on hold as I want to test the Avon RIB 340 against my Avon R310 with wooden floor ride on the Tomales bay in white cap choppy conditions.