There seems to be a fine line between too much hardener in the filler, and maybe not enough. After 12 hours (in a cool basement), I've got some patches that are still slightly rubbery. I brought them upstairs this morning hoping the warmer temperatures would help.

If the filler stays rubbery, is there anything that can be done? It's definitely too hard to scrape off.

Yet another learning experience.

Cheers,
Richard