Here is repair info for Snark which is same construction:
HULL REPAIRS : use two part epoxy cement for all repairs or reattaching rub rail. Obtain locally May use epoxy cement or automotive epoxy fillers. For large areas you may use fiberglass repair kits. All above locally available.
DO NOT USE ANY PRODUCT CONTAINING PETROLEUM BASES.
DO NOT USE FIBERGLASS KITS WITH POLYESTER RESINS.
WEST SYSTEMS Epoxy coatings can be found at
Painting ABS - Most enamel paints will adhere to ABS. Use several light coats. Test paint in a small spot first.
DO NOT GET ANY PAINT ON ANY PART OF EXPOSED FOAM - IT WILL DISSOLVE IT.
Painting Sea Snarks - This all foam boat can be fiber glassed, obtain materials locally. Any petroleum based paint will dissolve the foam.
DO NOT USE PETROLEUM BASED PAINTS DIRECTLY ON FOAM