There's several things in the market that'll work. One is a stick of plastic epoxy type product available in marine stores that you apply heat to and melt it from the stick onto the hull after cleaning the hull. It works OK for small holes. Aluninox may be its name.... not positive.
5200 fast cure is easy and inexpensive.. Clean the area thoroughly for good bonding.
Waterproof Blind Rivets are another method, but work better if you can apply a washer from the inside to reinforce the area.
I've seen applications of West Virginia Chrome (duct tape) used in a pinch.