Rear hiking strap resin material

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What type of material was used to reinforce the aft hiking strap at the four bolt location...wa Sailboat 6.JPG s this just fiberglass resin?
I replaced my hiking straps last year. It looked to me like it was just dipped in resin.
Instead of mounting the strap there, I put a loop in that end and made a bridle out of scrap line that is tied to each side of the aluminum bridge.
If you have a choice, use nylon webbing. The stuff I replaced was polyester and the sun was turning it to dust.