I`m no expert, but between years of patching up old Corvettes and race car bodies, I wouldn`t go the resin route for a hood insulator pad. Trying to marry a rigid material (resin) to a flexible piece of insulation just sounds to me like too much work for a high possibility of failure. I`d suggest researching KBS Diamond Finish Clear. It`s a somewhat flexible coating that is as easy to apply as paint, but should seal up your hood pad, making it easier to keep clean.
I had an old-school fiberglass mat under the hood of my El Camino that was just impossible to clean. I found some Reflectix insulation, merely foil faced bubble wrap, cut to fit and glued it to my hood underside with silicone sealant. It`s been on there for 6 or 7 years now and is very easy to clean, brightens up the otherwise dull engine compartment and hasn`t caused any deterioration of the ancient lacquer paint on the hood.
Bill
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