How to do it
Put a piece of paper between the fabric (i.e. inside the t-shirt) to prevent the print smudging.
Dab Textil Color fabric paint onto the foam stamp using a foam stencil brush.
Press the foam stamp down onto the fabric.
Press lightly and let it dry afterwards.
Fix the finished design with an iron for approx. 3 minutes at a temperature suitable for cotton. You may put a piece of baking paper between the fabric and the iron.