Was about to head out fishing when I noticed my guide was bent upwards a good bit. Bunch of little kids running around the house and I guess it was bound to happen. I bent it back but now I must deal with the cracked epoxy. Will clear nail polish do? I don’t really want to spend 15$ on some epoxy to fix it.

You want to put something on it to seal it, but you want sun protection.  I think Sally Hensen hard nail coating has UV filtering.  

 

This is not critical for strength, but you want to make sure that water cannot get into the thread.  If it does you will notice a foggy appearance on the wrap.  Don't overdo it, just where the crack is.

 

I've used rods for years with little cracks at this spot with no fogging, but I've had some that fogged, so. . .try to prevent it up front.

I use Hard as Nails all the time for minor repairs. It’ll be fine. Another coat of epoxy over that may look worse than it does now. Just seal it up as Mick suggests.