I was patching up some holes/ scratches on a fiberglass panel and layed some bondo on it (not overly thick). I let it go overnight, but when I had a poke at it the next day, it was still sticky, you could scrape your fingernail across it and end up with some under there. I realised then that the stuff I used was probably "off" (or maybe the hardener was). Will the stuff eventually harden up? If it is to stay sticky, whats the best solvent I can hit it with to remove this mess? The weather forecast for here is about a week of over 100 degrees, maybe that will help?