I have been embedding items in small castings of 1.5 inches x 1.5 inches and approx. 1/4 inch thick. I am using castin' crafts resin. Using the same proportions I didn't have any trouble in the summer but now that it is winter and cold (working in a garage without much heating) I am afraid the resin might not cure. Will it just take longer, or am I hooped? Thanks for you help.