Works great on cotton if you have a hot iron and lots of time. I put a piece of cardboard under my shirt to hold the iron in place and pressed each letter for at least 45 seconds. I did that three times, then turned the shirt inside out and pressed the letters on the back for 30 seconds each. I then turned the t-shirt over and removed the plastic once the letters had completely cooled. Finally, I slipped a thin t-shirt over the letters and pinched all the edges to secure them. The process took a long time but the letters are perfect! I just made the shirt in the picture but I have others that have been worn for years and still look great.
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