I do not think Microwave heating to eliminate moisture in fiberglass is practical. The oven in a microwave unit is a reflective
cavity. You would have to have a reflective chamber the size of the boat and a several megawatts of RF to be effective. There
would be dead spots and spots of excessive heating, just like in a microwave oven. Even if you would do this, you would still have
to provide a means of absorbing the moisture generated in the chamber's air. (Basic gas laws and equilibrium apply) There are more
practical ways of achieving this. It is important to understand the problem in order to find a solution. No construction material
lasts forever. They each have their disadvantages and advantages and a finite life. The failure mode of all fiber based plastics
are UV driven disintegration and osmosis. Osmosis is the wicking effect all fibers have when exposed to a liquid, which causes
hydraulic delamination at the weakest bond. Although FG is not waterproof, it is not readily permeable either and there is your
dilemma. Once moisture has invaded the material, it is next to impossible to get it all out.Even though fiberglass boat
construction has been around since the 50's, there are not many boats still around that old. The cost of FG hull maintenance is
only exceeded by wood. All other materials have a better TCO (total cost of ownership). I'm sure that statement will generate some
flames, but it is observable and self evident,
Steve.