There is a slight chance that once your epoxy resin painting dries it will be left with some indentations, cavities, or holes. This could be due to you having applied too much resin or not enough, which is something to consider at the beginning of your project to prevent this from happening. In the event that your final painting has any of these issues, you will have to gently sand the damaged surface of your painting with low-grit material and apply a new layer of epoxy resin.