P O T P, when you mix the resin and the catalyst, it makes a chemical reaction, depending on your mix, the more catalyst you use, the faster it will react. I would dip the f-glass in the mix and then apply it, you need to make sure it is good and saturated. make sure to wear rubber gloves and work fast, it gets very hot, hot enough to catch fire. dispose of the excess mix in water! read the directions and follw them to the T. you can clean up any mess using thinner. if mixed properly, it should take 15 to thirty min. to harden. P.S. this can be messy. good luck.