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Epoxy glue is very strong and sticks to most things. Although it's best if the mating surfaces fit well together, you can use it with care to fill gaps, but since it's quite runny it may not stay where you want it. There are several types of epoxy putty you can use instead. These tend to come as a stick containing both parts. You cut off as much as you nead then nead it with your fingers to mix.