This solution does not require you to find a matching paint. Get yourself an ironing cloth if you don't have one. They can be purchased at Wal-Mart for a few dollars and are very useful. Set your iron at a setting appropriate for the material, put the shirt on an ironing board and straighten out the number, place the ironing cloth over the number and iron away. If this doesn't work try a higher and higher setting until it does work. Let the shirt cool completely before you handle it.
I have twin 4 year old grandsons and I use an ironing cloth to press any shirt of theirs that has an iron-on. They never smear. These cloths are also useful when pressing any material that becomes shiny when ironed or if you're afraid you will scorch an item.
I have twin 4 year old grandsons and I use an ironing cloth to press any shirt of theirs that has an iron-on. They never smear. These cloths are also useful when pressing any material that becomes shiny when ironed or if you're afraid you will scorch an item.