The bow has taken a few bumps near the waterline over the years and had a small hole, about 2 cm in diameter, where the fiberglass was pushed into the hull cavity. Using a dremell tool, I remove some of the surrounding fiberglass and core material. Apparently airex foam doesn't rot like balsa core when exposed to water. The spread of cracking and water damage was isolated to with 4 inches out from the original hole.
Next step was layering epoxy and cloth into the cavity where the airex was removed (between the inner and outer fibreglass layers) with the dremell. over a period of 3 days, the job was done and completed with a grey primer overcoat.
Will check the repair again during fall haul out.
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