Originally Posted by WhyFi

If there wasn't already a tube inside of the tire, that's what I'd recommend, too, but if he's going to have to futz around with removing the tube and whatnot, might as well patch it up.

Of course, we still don't have the full story - if it's a smaller cut (<1/4") and it's not sealing because he's using Stan's or the sealant is old, putting in some fresh OS and re-mounting them might be all that's needed.