Dichloromethane or methylene chloride
Fibreglass resin is a polyester.
Polyester resin is a thermosetting resin, generally a copolymer
it
Acetone will work fairly well to remove the polyester resin--until the resin sets. Trichloroethane (e.g., ZipStrip) will soften the cured resin, possibly enough to remove it. Always try it on an inconspicuous spot before you commit to treat the whole garment. I know of a guy who had to wear a towel home because the acetone turned his polyester trousers into what looked like snot when he soaked them.
No
as polyester resin is a bi-product of oil so if the prices of oil rise then it is definite that the polyster resin price will also rise.
yes
Yes, it is possible.
It will not mix.
The poission ratio of orthophthalic polyester resin it's 0.37.
polar
You would machine it on a lathe, carefully.