Yes, these are definitely surface nicks and not in the structure of the tire. Mostly on my rather new (only for racing) Vittoria Corsa EVO CX tires. Lots of times the nick will actually be a little “flap” of rubber so I figure gluing it down is better than leaving it and the opening exposed. I did have a larger cut (+/- 1/2") that was deeper but not visible from the inside. I used a Park Tools “boot” http://www.parktool.com/product/emergency-tire-boot-tb-2 on the inside and Super Glue on the outside (deflated tires to get good contact on the edges of the cut) and rode the tire until the tread wore out in general. Not sure if the patch was the reason but it certainly didn’t hurt. The Shoe Goo is an interesting idea, I’ve used it on expensive hiking boots. Thanks for the responses.