A customer has informed me that one of my paintings was damaged in a move. Something fell against the stretched canvas making a dent and small hole. I know I can repair the dent by spritzing it with a fine mist of water and/or dabbing it with a moist sponge but I have no idea how to repair a small hole. Anyone have any knowledge or experience with such a repair? I have not seen it yet so not sure how severe the damage is.