The tire is cheap enough to replace for tummy comfort. If the cut is just in the rubber and not exposing the cords it is superficial. I have seen cuts exposing the cords on Bushwheels and the manufacturer advised me to put black shoe goo in the cut to keep the uv off the cords.
Here's a pretty good primer on aircraft tires, I learned a lot just scanning it for a few minutes.
I'll definitely read thru this for general knowledge.
https://www.aircraftsystemstech.com/...aft-tires.html
GG
Glen Geller
1955 PA22-150 "One For Papa!"