• Most patching kits will come with a sandpaper or a file. The purpose of this is to make the texture rough near the puncture (but don’t wear it totally away, this is to create a surface that will grip better).
• Make sure the solven you apply is over an area larger than your patch.
• After applying the solven be patient and allow the solven to work. 10 minutes is a good amount of time for this (the solvent melts the surrounding rubber, when done not that the solven should not look wet).
• When applying the patch to the tire try to not touch the underside making contact to the tire (if you do, don’t panic, but try not to in order to give the patch the best chance to take).
• Use an object (not your hand) to press down on all sections of the patch to ensure the patch is adhesion is evenly taking place over the entirety of the patch. A paint roller or baking roller is a nice tool for this (although note not to get solvent on a baking roller you intend to use for cooking).
• When done, inflate the tube to around 5 PSI which will allow you to peel the plastic backing off (again be patient).

It would be wise to let the tire sit for a few hours to ensure it holds air before taking it on any lengthy excursions if you have that opportunity.