You are risking a bleed through. When printing on fabric, you put a piece of cardboard or a waxed paper between the layers of fabric so your paint or ink won't show on the back of the shirt as random smudges and blotches. If you have a waxed paper between the layers of fabric it is self-evident that you need to remove it before you iron the fabric to cure the paint to the fabric so it won't come off with the next wash. FYI there is facric medium doe acrylic paint. And if you print on dark fabric it is a good idea to have a last layer of light opaque color on a multicolor build up on the gel plate which you can lift with the medium or that last layer of opaque light color.
You are risking a bleed through. When printing on fabric, you put a piece of cardboard or a waxed paper between the layers of fabric so your paint or ink won't show on the back of the shirt as random smudges and blotches. If you have a waxed paper between the layers of fabric it is self-evident that you need to remove it before you iron the fabric to cure the paint to the fabric so it won't come off with the next wash. FYI there is facric medium doe acrylic paint. And if you print on dark fabric it is a good idea to have a last layer of light opaque color on a multicolor build up on the gel plate which you can lift with the medium or that last layer of opaque light color.
Yes you are right about the piece of cardboard or a waxed paper, I learn that lesson the hard way on a different project!