Give appropriate time to dry the shirt after painting. Avoid removing the paper or cardboard that you placed inside the T-shirt. You can undeniably use a hair dryer to dry the wet paint rapidly for better assistance with the drying phase. Besides, iron the T-shirt at low heat settings once the paint gets dry to make sure the paint gets more durable and robust. Moreover, to prevent the paint from cracking or fading, washing the T-shirt like Bella Canvas 6400CVC inside and out is advisable. Do not add bleach or fabric softeners to the T-shirt while washing; it may result in paint spoilage or less fabric absorbent. Read additional details on How to wash and care for polyester.