Aye Propeller,
"How does wet lay carbon fibre (like I know what I'm on about) go on with a) regs b) ethanol?".
I don't know is my simple answer.
I have never needed to purchase a tank but there are some outfits out there who appear to know what they are doing, but I am reluctant to post links, just in case. I haven't had a 'Search' of the sites 'Recommended' suppliers and you might find something in there.
Regards, Bill.