I had bad experiences with glueless patches in the past (Slime Skabs from Walmart, specifically), so I started using Park patches with rubber cement, and they've all worked fine. However this past Friday I had sort of an emergency repair situation, and got some Skabs glueless patches from Walmart since that's all they had, and it worked out fine. I just scuffed the repair area, wiped off any debris, and pressed the patch in place. I put plenty of pressure and made sure it was fully adhered across the whole thing, the reinstalled and pumped up the tire to 70 PSI just fine.