Thanks sleepy. I can't say I've enjoyed every aspect of this repair project either. I put it off for as long as I dared, and was very worried after I started it that it may turn out to be in much worse shape than it appeared. The camper is after all 13 years old this year.
Now that it appears that I'll be able to get things back together without having to totally rebuild a major section, I'm feeling a little better. There's still several hours of work to do yet, though. Covering the tub area with FRP is tedious work, and a little uncomfortable at times. Cutting it is easy enough, straight cuts from edge to edge can be made just by scoring the backside and snapping the panel. But many of the cuts require a circular saw, sonicrafter, or a hole-saw, and that sends glass fibers into the air that are just as bad as working with fiberglass insulation bats. I'm using FRP adhesive to stick it to the camper, which is applied with a notched trowel just in case anyone is wondering. A little messy at times, and it has to be cleaned up with mineral spirits.
As far as loving or hating filon goes, I'm sorta agnostic. It could probably be as good as any other RV siding, but the way it's attached to a backing material that readily absorbs water (hydrophilic?) it seems to me is inviting problems. I'm not even sure if coating things with spar urethane like I did is going to help that or make it worse. Time will tell, I guess.
And btw, MY wants are ALWAYS reasonable. It's those "other guys" that want unreasonable stuff! :W
:):)