Before I offer my thoughts on this, I probably know what everybody is going
to be thinking....is he crazy? Maybe. Of all the reading I've done, I've never read
anything about anybody using gel coat as a final finish. Many years ago I used
to work with gel coats and resins as I owned and operated a small marine repair
yard and did quite a bit of prototyping for some boat manufacturers and was
involved in other projects building plugs and molds. For those who have never
done this kind of work before, or who have limited knowledge and or experience,
the process of using gel coat may seem like a long and arduous process compared
to filling, priming and painting, which seems to be the only type of finish I've
read about.
My question is how does gel coat wear on an aircraft insofar as stress
cracks and wear in general? I know that on a boat the cracks will, eventually
almost inevitably appear around the hardware attachment points such as chain plates,
cleats and winches. Anybody have any comments or experience with kit planes that
have gel coat as a final finish or what they've done themselves? My personal
preference is gel coat, as I don't think you can beat the depth and luster once
sanded and polished out.. I know that gel coats have improved tremendously from what
I used years ago, so the gloss should be very satisfactory, but certainly not as great
as Imron or any other paint.The weight of gel coat and Imron are close. Gel coat weighs
about one and a half to two pounds more per gallon, varying with color.
When sprayed properly, the first coat of gel coat can fill almost all pin holes
and fill the weave in most places enough to be blocked and sanded to a flat or fair
finish. Spray a second coat, then sand and polish. Sanding gel coat isn't too bad if it's
sanded within the first couple of days after spraying as it is rather soft within that
timeframe. It's a lot work I know, and is probably more work than filling, priming and
painting, but again, that's my preference.
If anybody has done this, and can testify to the longevity, I'd appreciate it.
Everybody have a good day.....