My project is casting some of my wedding flowers in a round silicone mold that's about 9.5 inches in diameter. Due to somewhat limited supplies, I have been measuring batches in small plastic cups, using about 6 of each part per layer. On what should have been my second to last layer, I accidentally left one of the cups of hardener out of the mixture without realizing until now when it has been attempting to cure for almost four hours. I know it won't ever cure properly as is and I don't know what to do. I can't get my flowers back if I am unable to salvage the project. Is it something that adding another layer on top that is mixed properly could fix or could I try and scrape it out if it is gooey in the morning? Any advice would be greatly appreciated!!