Patches can be ironed onto cotton, denim and wool.
DO NOT APPLY iron on patches to waterproof rainwear, highly elasticized fabrics, rayon, nylon or similar fabrics. If unsure, test with an iron on a hidden seam or hem to see how much heat the fabric will accept without damage. Cotton and polyester fiber blends work best.
Remember patches can also be sewn onto fabric or garments with a single or double stitch by sewing along the border of the patch for extra security.
When using an iron, set it to cotton (up to 350 degrees farenheit).
Place a damp cloth over the patch and iron onto desired fabric or garment while applying firm pressure for 30 seconds.
Allow patch to cool for 5 minutes.
Turn fabric over or garment inside-out and iron the area behind the patch applying firm pressure again for another 30 seconds.