Do not iron on patches to your leather or Nylon Jackets.
Problem is the iron on temperature required to activate the glue on the back of the patch is 270 degrees Fahrenheit. If you apply this heat to Leather or Nylon material, you'll end of scorching it.
You should always sew patches on to your leather. Heat Pressing is reserved for applying patches on to materials like denim or cotton or any synthetic that can withstand the heat.
