As a thought, if I were to bush hardener over the unset stuff, would it harden?
Or even harden enough to sand/mechanically remove?
Although if it didn't harden in correct ratios, it probably never will.
Wheels, I wasn't mixing products, this was a fresh layer
Brushing the hardener probably wont help, it is not like the catalyst for polyester, try a strong solvent like acetone or paint thinners and scrub with a coarse steelo pad like the SS ones. I have also had luck with painting a coat of interprotect over the gummy surface and then scraping or sanding that off after it set good luck !