This, like most other "quick-fix" methods generally results in a pretty lousy repair. Epoxy does not adhere to wet core materials as a general rule and this type of repair doesn't really dry the core out. In most cases, the water has taken months to penetrate the balsa core, and unless the core has disintegrated almost completely, it will take a long time for it to yield up the water it has taken so long to absorb.
Letting the epoxy saturate the area in this method will make replacing the core material when you do a proper repair job much more difficult. If you're going to fix this, please do it the right way and remove one side of the laminate, clear out the wet core material and then replace it and then glass in a new skin to replace what you removed.
Originally Posted by travlineasy
I have some wet spots on my 33 Morgan's deck near the mast boot. The boot is completely sealed, but nonetheless there are wet spots. I talked with a fiberglass repair guy at the marina who said he can fix the problem by drilling a few holes in the top of the cabin, then attaching a Hi-Vac to the lowest hole and over a period of a few days, draw the water from the balsa core. He then pours acetone into the highest hole while the Hi-Vac is still running and draws it through the core to finish the drying process. Next, he pours a very slow drying Epoxy into the highest hole, again while the Hi-Vac is still running. When the Epoxy resin reaches the Hi-Vac he shuts it down, waits about 4 days, then seals the fares the openings. He said the process essentially solidifies that portion of the core that was previously wet, adheres it tightly to the surrounding fiberglass, and does not add a significant amount of weight. No, it's not as good as new, but if everything goes well it should last about 20 years, which is longer than I'll probably be on Planet Earth.
Good luck, and keep us posted on how the repairs progress,
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