AFAIK GP resin is gasoline PROOF. Old fashhion GP (general purpose) polyester resin is dissolved by ethanol, the glass fibers are immune to "E". I spent over 10 years trying to source a resin type material that resisted BOTH gasoline and ETHANOL. Only the novolac epoxy/vinylester resin sold (at the time) by Ashland chemical in Ohio, claimed to do the job.
Two of the 3 blends were approved by the US coast guard for use with E-10 use in boats. Mainly for flame suppression properties. I bought the 3rd generic type.
It was a process developed by another company then sold to Ashland , and now sold to a company in India
![Frown :( :(](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f641.png)
I do not believe in the
long term protection of slosh type chemical linings. The resistance to gasoline and ethanol is NOT guaranteed in print by the manufacturing company. It is documented as ocassional contact ethanol"resistant" NOT ETHANOL PROOF.
novolac epoxy/vinylester resin is I believe what a very few tank makers use ( I have a 5 gallon pail to try it out)