I found (easily) the plastic type - PA6.6-GF30 is a polyamide, plain old nylon 6,6 (aka 6.6, 6/6. or 66), with 30% glass fiber fill. I went to the NAPA store and found two different epoxy kits that supposedly are for "permanently" patching plastic radiators and tanks. I'm trying one out tonight.
I'll still probably get a new tank, but now it won't be an emergency situation.
Ed
