The main steps of patching a tube are:
1) Sandpaper around the hole
2) Apply glue around the hole
4) Apply the patch
Which of these is the most important? Which is most likely to cause a bad patch?
I ask because I'm having a low success rate with patches and wondering what to improve. Is it important to sand the seam all the way down? Is there a technique to squeezing the patch on so it holds? Etc!