Cheap but none of my 3 attempts stuck properly. After each time and leaving for at least 12 hours the edge of the patch in at least one place had not stuck and when I pulled on this edge the whole patch came off with minimal effort.
Not sure if it's an issue with the glue or patch (both?).
Over the years i have successfully repaired many tubes so i do know what i'm doing. Yes i did sand it and waited a minute after gluing and applying the patch.
Not worth returning at the price.
Comes with instructions and sandpaper in a neat case hence 2* and not 1*