Step 1. Find an applique that you like. Cut it out. Cut out a piece of Wonder Under, that is big enough for your applique.
Step 2. Iron your material, wrong side up.
Step. 3. Place the wonder Under on the material, placing the bumpy side to the fabric. Press with a hot, dry iron for about 15 seconds until it is stuck well.
Step 4. Trace your applique onto the wonder under. Cut out the applique.
Step 5 and 6. Remove the backing on the applique. I use a seam ripper to carefully slice a small line in the backing and then I peel it off. It is the easiest way that I have found to get the stuff off!
Step 7: Press the shirt that you are putting the applique on.
Step 8: Place your applique on the shirt. Adjust it to where you would like it. Press with a dry iron, set on the wool setting until applique adheres to the shirt. This only takes about 30 seconds.
Step 9: Wear your cute shirt!
You can also sew a cute top stitch around the edges of the applique. I recommend this. I left the top stitch off of this shirt and washed it to see how it held up without it and it was did great! However my little 2-year-olds fingers managed to peel it off.
This is great for those stained t-shirts and onesies!! Extends their lives and makes them oh, so cute!