The Tiger hulls are all layed up with polyester resin NOT epoxy, so never use an epoxy based product on it, always use polyester based.
We regularly repair damage to Tiger hulls and for damage such as yours we would first sand out any damaged "foam", wipe the area down with acetone on a rag, fill the area with a "filler" IE "Q" cell mixed with polyester resin mixed to a "non slump" consitency, then "skarf" the edges of the glass so that there is the greatest surface area to bond the new laminates of fibre glass to, glass into place over the area at least two laminates of "E" glass cloth (probably 6 oz) then gently fair back the edges to match the undamaged glass (always leave the main area of the damage slightly hollow to enable the application of gel coat to finish, mask off around the damage, apply "flo" coat gel coat (flo coat has extra wax in it to enable it to "set" in air exposure with out remaining sticky thereby enabling it to be sanded back when set), fair back the area to match the hull shape around it. If there is still "hollows" apply another coat of "flo" coat and fair, fair the finished area with wet and dry paper (800 grit to 1000 grit), cut and polish with a "coarse" cut and polish compound using a lambswool buff at a very slow speed. If it is done properly there will be no visible repare. Be careful when touching the surounding undamaged gel coat as the layer of gel coat on the Tigers is very thin and you can sand through it VERY easily.