Okay, due to lots of experience with fiberglass, I am biased (to a man with
a big hammer everything looks like a nail), but here goes.
I never knew the micro-effects of sand-blasting (Andy Costs' comment) but it
makes total sense. The delaminating some have mentioned is probably one of
two things: a) rust bubbling from below (remember, once you treat steel, get
the coating on there quick) B) lay-up is resin-rich, which adds stiffness
but reduces flexibility. From your boat work, you know that the resin will
'pool' in areas like floorpans. One trick is to wet out the cloth/mat on a
piece of plastic (correct kind of trash bag), brushing the excess off the
edge of your cloth, then transfer the cloth to the area to be covered. The
resin will also want to pool in the corrugations in the floor, making them
stiff (good) and brittle (bad). Take some of the mat and make a 'rope' and
fill these as much as possible. Or, lay down plastic and push the plastic
down into the grooves with dowels, put a weight on top and remove the
plastic/dowels after 24 hrs, then you'll have channels to catch spilled
coffee. (sorry, personal experience there)
This is an ideal application for vacuum bagging cure, (removes more excess
resin, better adhesion and long term flexure) but that is better off not
dragged out for everyone, making the post lengthy. (too late?)
Fergus, O, 69 2000
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