Similer story with the poly resin also. I covered an entire wing with some stuff I bought from the local home center and days later itwas stilltacky. Icalled the vendor and they told me how to read the date code and found out it was months too old. On his suggestion I recoated with a fresh batch and that helped cure it but Istill ended up wet sanding a lot of it off with 80 grit paper

Iwent back to the home center and told the guy in the paint dept that all he had on the shelf was outdated. Ionly use epoxy now and have never had a problem and the smell is much more tolerable. Close call VJ