I am playing with a fiberglass project and the first strip I laid does not seem to want to set-up and harden. It's been 24 hours and it's still very tacky. I thought I used the correct number of drops of hardner; if anything I put in too many. Could that make it fail to harden? It's not real cold here, which I know can cause problems, but I put a heat lamp on it just in case. Any ideas if it still fails to harden. Is there something I can put on it to harden it or will I be stuck scraping it all off and starting over?? Thanks.