I had some cracking in the gelcoat job I did last year. I figured I just mixed a hot batch (too much catalyst) and it cracked from being too brittle.
Nah! Look what I found under the crack. Same thing that happened to my Kachina a few years back, and almost in the same spot.
All the white/yellowish (dead glass) has to come off and get re-glassed. I don't know if it would've come apart or not, but if it did...........it would've been a bad thing. Picture flying along at 80 or 90 mph and having that area come apart. This is a pretty light layup (450-500lbs) and not that thick especially right in that area. I'm guessing that by the time I clean up all that dead glass, it won't be more than 1/8" thick right there. It goes pretty deep.
I think this is what took Southwind Sal's boat a year ago or so?
Check your boats fellas.
You can see where the white (dead) glass is spreading out on either side of the crack. Gotta get this off or the new glass won't stick worth a darn.
Here's where my Kachina came apart. This one separated from underneath. Didn't even know it until I put it on the trailer moments after making several 85 mph passes. My kid noticed it and pointed it out. A piece about 6" wide and 1' long just peeled away. You can even see the mat where it peeled away a piece of the gelcoat on the transom. Basically took the strake out.