You can also use a folded up newspaper for this. Even an old magazine or catalogue will do in a pinch.
If you want your design to have multiple colors, such as a smiles face, do the background color first. Let the paint dry, then do the details. Try to get paint brushes meant for painting fabric. They usually have stiffer bristles made from taklon. Avoid natural brushes, such as camel hair, as they will be too soft to hold the thick paint and create nice designs.
Once the paint dries, you can flip it around and paint the back as well. Keep the cardboard inside the shirt and let the paint dry.
If you are using a stencil meant for painting fabric, it will likely have a sticky back. All you have to do is smooth it down. If you are using a regular stencil, or if you made your own, coat the back of the stencil with repositionable adhesive spray, then press the stencil down. [1] X Research source If you are using freezer paper, iron the paper shiny-side-down onto the t-shirt. Peel it away after you paint the shirt. [2] X Research source
If you are using a fabric painting stencil, it will probably have a sticky back. Simply press it onto the shirt and smooth it down. If you are using a regular stencil, or if you made your own, spray the back of the stencil with repositionable adhesive spray, then press it down onto the shirt. If you are using freezer paper, simply place the stencil shiny-side-down onto the shirt, then run a clothing iron over it.
If you are working indoors and start to feel lightheaded, take a break and go outside for some fresh air.
Consider spraying the design using clear sealer first. This will give you better control over the paint and prevent it from soaking into the fabric. Be sure to let the sealer dry before applying the paint. [10] X Research source
