It depends on if they are silk screened or ironed on. Typically the kits are iron on. If it is the iron on kit and it is new, wash it or worsh it depending on what part of the country you're from, a few times and dry it right side out in the dryer. I did this with a couple of mine (they were the iron on kits) and the edges started to pull away. I was able to grab the edges with a pair if tweezers and pull the lettering right off
. If they are silk screened your screwed