saywhatthat wrote:There so many things that call them shelf fiberglassdose it glisten? 99% of what they call fiberglass is not old school spend glass. Try sanding a 63 vet with no shirt.lots of fiberglass shards in the stuff that gets on my arms
yes epoxy make a great glue. We have found doing a polyester laid over cured polyester cut some small slots in old glass. faster than drilling holes for more mechanical bond.
Plastic, such as the high density stuff, like cutting board we use as backing dose not stick to polyestercost is a give a way and the burn testThe FRP I'm using looks to be polyester resin
Where you live has a lot to do with it made from
Yes, it glistens.
I have no idea what you are saying : "Try sanding a 63 vet with no shirt"
I'm glad you have success with polyester resin. I'll never use it. Zero confidence in the stuff for laying up fiberglass over stuff already cured (mechanical bond).
This FRP I have cost me nothing. I scrounged it. It came off the top of an over-the-road trailer. I got two big rolls, about 10' wide and about 40' long. It has some holes and cracks and some 3M VHB tape still stuck to it, but I can cut around that or patch where necessary. It has years of road grime on one side, but it is easily removed with the flap disk or even the RO sander.
Also, in case you are interested, I use 40 grit zirconium disks on my RO sander to prep the surfaces and clean-up after cure. I hate sanding, grinding and grinding. These disks really cut and really do last much longer than alum oxide disks. On my boat projects I learned to just use some of that high-build marine epoxy primer when I'm ready to paint. It fills the 40 grit sanding scratches very well. Then when I sand the primer in prep for the top coat, that's when I go to finer grit.