Covered my last JHH F-4 surfaces with West System epoxy which I bought from local West marine outlet. You also need to buy the pump to ratio & dispense the resin & hardener (not equal volume). I diluted with about 30-40% denatured alcohol, which makes it really easy to spread & not have any excess resin & very little added weight. West system epoxy has a longer set time than the 30-min variety, so one does not have to hurry with the job. Best to use the paper cups from West with the wider mouth, as this leaves a shallower the mix that dissipates heat; which otherwise can accelerate its setting. Have fun

Phil