Place plastic inside the T-shirt to protect the back from paint. Protect your work surface with plastic and lay out the T-shirt as evenly as possible. Write the large text with masking tape or regular tape. Write the text underneath with hot glue (do not allow the tip of the glue gun to touch the shirt). Now use a brush to spatter the t-shirt with paint in various colours. Let the paint dry, then remove the tape and the hot glue. Fix the paint with an iron according to the instructions.