Crafting Hint of the Day - Tip on Painting on T-Shirts/Sweatshirtsgreenspun.com : LUSENET : Cooking & Crafts : One Thread
When painting on t-shirts or any fabric, apply a piece of contact paper [slightly larger than the design you want to paint] to the inside of your project. This makes it impossible for the paint to bleed through to the opposite side of your material, and also insures that your fabric will not shift while your working. This is especially helpful when working on sweatshirts. The contact paper will keep your fabric from stretching while you paint.
-- Karen (email@example.com), April 16, 2002