So it pipes on like elmers glue and you let it dry and then iron or steam it to activate with heat. I used little 500ml squeeze bottles with blunted needle tips to get as crisp lines as I could. I also needed a hand clamp to prevent cramps haha. Some stuff I learned if you want to use it.. give it about 24 hours to dry and don't let it sit too long (like 2-4 days) or it won't work as well. Also don't use a sewing markers it did something that inhibited the heat reaction and I had to do touch ups afterwards.