Recently when I was replacing a fixed portlight assembly with an openning one, I found a water intrusion problem that had started to affect the interior veneer around the portlight. When the bedding on the frame failed water came in and found a void in the edge of the plywood that the veneer and fiberglass are laminated to. The water penetrated the plywood and emerged thru the veneer.
Before reassembly I sanded the plywood edge well with a small drum sander, filled the plywood void, and coated the exposed plywood edge heavily with epoxy to resist future water intrusion if the bedding ever fails again. Rebedding was done after the epoxy cured. This is of course similar to the process recommended for water proofing other bedded items such as stanchions without actually removing core material before epoxy coating.
Before reassembly I sanded the plywood edge well with a small drum sander, filled the plywood void, and coated the exposed plywood edge heavily with epoxy to resist future water intrusion if the bedding ever fails again. Rebedding was done after the epoxy cured. This is of course similar to the process recommended for water proofing other bedded items such as stanchions without actually removing core material before epoxy coating.
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