Do any of you guys have a good method of fixing or anything for lable peeling on Nes, Snes games etc..?

A little bit of glue from a glue stick is what I used. It always worked for me, but it might not be the absolute best method.

I just rip them off. It just a game. And it's mine. I'll do what I want.

well its for a rare game

oh. Well then I'd definitly use gum.
edit...
I am just being silly. Be very carefull and use some glue.

The best method I have is Elmers Glue Stick (kiddie version with purple stick that dries clear) and a razor blade. You nick a little glue off the stick,and then get it up until your curl as far in as you possibly can go, and then apply around the rest of the thing too. Then using your thumb, move it firmly away from where it's still attached to the edge. Hold in place for a minute or a few and then release your thumb slowly again in the direction away from where the label didn't come up just to be careful. Then as it has dried enough wipe away (same direction again) clear with a paper towel or again your thumb to remove the excess.

As long as the curl isn't something worse where the label has discolored or shredded it will lay flat and you'll never know the difference if the curl never folded anywhere along it or worse. I've done this on more 'pricy' carts too.

ok its not discolored or anything and its small. ill try this method. btw its on my duck tales 2 cart

^ what he said Elmers Glue Stick. Sometimes I put the glue on the end of a toothpick so I can add the right amount. Then smooth it out by pushing down and outward toward the edge of the label.

thanks

Avoid send it to Cecilia Giménez, the "infamous" Spanish restorer.

I use the elmers clear liquid glue. It doesnt leave a spot on the label or plastic you cant rub off and it dries clear.