couple of ways to attack this, depends on how much you want to do and what level of finish you are after.
I personally would just pick up some fiberglass, say 4-6 oz glass, won't need much given the size of that boat. I would then pick up some epoxy. Sand the paint all off, get down to the glass on both sides. Cut out some patches at least 4-6" larger than the cracked area. Wet out the area with plain resin, lay the glass, then wet out all the glass. I would probably lay 1-2 layers on the outside, and 1 on the inside like this. Again, depending on how severe an how large of an area this is. This should probably do it. Once fully cured in a few days, LIGHTLY sand and repaint.
http://www.uscomposites.com/
this is the place I use for my glass/epoxy.
http://www.raka.com/ is the place alot of other guys use from this forum.
I have no sources of EPOXY in Green Bay other than buying WEST System and that is too rich for my blood.
Old guy on Main street, Siefert's sold polyester resin and glass, just around the corner to the east from Mason, don't know if he/son is still doing it, but the glass you would not have to ship, but DO NOT try to use polyester resin for this job, epoxy will stick and the PE will have problems in my book.
Other ways to do it, this is one.
Good luck, post some pics when you are done.