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You could use West System epoxy. If you do you will have to gelcoat, paint or cover the repair with a fitting because the epoxy will deteriorate in sunlight. For holes in a vertical side you'll have to be ready to slap a piece of masking tape over the repair to keep the epoxy from running out. You could mix colloidal silica into the epoxy to thicken it up but wear a mask because you really don't want to inhale any of the silica which will seem to blow around when there is no breeze. You could use MarineTex. You can get epoxy syringes for a dollar or two each where they sexy a West System epoxy which make injecting the epoxy into holes easier. I don't think MarineTex deteriorates in sunlight like epoxy but it's thick so you would probably use a plastic putty knife to squeeze it into the holes.