It has been a while since I have used those patches. If I remember correctly the instructions say to put a towel between the patch and the iron on delicate items. This will be a two person job, one on the inside with the iron, towel and the patch. The other on the outside with a block of wood and maybe another towel over it as a backer. The patches take around 90 seconds for the glue to melt and setup.
The glue eventually fails from flexing so you may need to redo the iron on patch in a few years. The patches can be found in most fabric stores.
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Current van: 2002 Ford E350 extended body camper with Colorado Camper Van pop top and Agile Offroad 4WD conversion.