Instructions to iron on a patch Iron on Temperature should be 280 degrees Fahrenheit (plus or minus 10 degrees is acceptable). Make sure the garment you are using can withstand the heat. Step 1: Preheat the area where the Patch will be applied. Step 2: Place the patch over surface and Press for 30 seconds using a heat press. Step 3: Do not move the iron around. Step 4: Hold it down for 30 seconds applying some pressure You may wish to consider stitching around the edges of the patch to ensure a prolonged lifespan / to protect against general wear and tear