
Actually, I think your Sunfish took a big hit—or re-damaged an earlier hit. "Resin" is a very good glue, but it's not going to help (very long) in this case. "Spider cracks" are one thing, as you can mostly ignore them. From these pictures, however, I'm
not going to suggest that you stop sailing!

I don't know when your season ends, but such repairs I'd leave for the off-season. My bow took a hit this season that left a ½-inch
hole that's now covered with a duct tape "bandage".

Our New England boating season ends soon, so I'll leave that repair until Spring—when the ice is gone, the water's still too cold for safe sailing—and the sun is out.
We use two+ techniques here: if you go to the "Ultimate" 10-page repair site at this forum,
below, you'll find multiple repairs and videos addressing them. The first suggestion was that he abandon his "old" Sunfish and find a better boat!

Determined to learn how to fix all his boat's ills, member
Whitecap soldiered onward.

The many suggestions and final repairs were collected by member
Whitecap. (To whom I tip my hat).
All of member
Whitecap's aggregated repairs are typical of necessary Sunfish repairs—my most major repair included. Mine involved a big hit to the keel, and I found myself grinding deeper and deeper—until a 2-inch hole collapsed underneath my sander!

In your case,
I'd use the "Shoreline" technique in a video there. (I've used both repairs). But other opinions are sure to follow mine

. (My day just begins earlier than most sailors').
Hardware stores carry complete fiberglass kits, including gloves and thickening agents. One $35 kit should finish your repair. For bigger repairs, they're typically short on resin

and generous with cloth.

West Marine's $22
Rx Epoxy Repair Kit is not for structural repairs (which I think yours will turn out to be).
Link to repairs:
Starting at the BEGINNING
.