Cracks?
Depends...
The cracks you are talking about are most likely 90 degrees to the direction of the blank and at the base of the guide feet.
This could be from a bunch of reasons: Hitting the rods too hard and hyper flexing the blank, Too much grain load hyper flexing the blank. The blank is going to bend only so far until it hits the re-enforcement from the guide feet. When something is the going to give, it is usually the finish at the base of the feet.
The last rec was good for a fix. The only thing I would say is: that resin dries pretty hard and may happen again shortly, in a while, after a long while. Maybe go with something that cures more flexible like AftCoat, ThreadMaster or any of the finishes designed to go on top of thread?
BB~