I repaired 20 sqft of spongy decks in an Ericson 37 myself in about six days at
a cost of a few hundred.
The result was excellent...no further problems and absolutely invisable. Here's
how:
1. Removed the headliner under the soft decks
2. Routed out the lower glass layer (the rot was visable thru the glass)
2. Cleaned out the rot
3. Made templates of the cut out areas
4. Cut out 3/8" phenolic (resin impregnated canvas) in the shapes of the
templates.
5. Cemented the phenolic into the cutout areas with epoxy putty
6. Filled in the periphery of the phenolic with epoxy putty.
7. Reinstalled the headliner. Done!
Good luck with it.
Ted