Getting epoxy to kick can be a challenge. There are a number of factors to consider, particularly the weather/temperature. However, I discovered that using an incandescent light bulb as a heat source can accelerate the curing rate of epoxy, especially in cold conditions. Typically, a 75-90 watt bulb works well, but the heat setting can be changed by screwing in a higher or lower wattage bulb. The heat can be concentrated and there is no flame to worry about. Here on a previous boat of mine, My
Time (see photo) I have epoxied wood strips to the bare fiberglass hull.
— Mark Kappeler, Boston, MA
Sometimes creativity is key, especially when you need to get epoxy to kick