Originally Posted by
wroomwroomoops
You know, I found this not to be true: I use a paper tissue with alcohol to clean the surfaces, let it dry (takes a few seconds) and apply the cement - and this seems to be quite enough. Not a single patch has separated afterwards. On the other hand, I had patches not stick perfectly, if I relied on sandpapering only.
This has been my experience as well. If you have never tried this type of patch, why not experiment? Scissors will cut up a tube easily.
Whatever the patch, let the cement dry per the instructions.
I tend to install the patched ones after testing with moderate pressure first.