Generally, fabric marker ink can take up to a few days to dry out completely. First, test the surface to check whether it’s completely dried out or not. Now, to activate the pigment, a heat setting can be required with some of them. For this, plug in the iron and lay a cloth over the painted fabric to protect the iron and ironing board. You also have to make sure the iron is set according to the temperature recommendations for your fabric, then move the iron over the drawing evenly to heat it up for 10 to 15 seconds. After the temperature setting, wash the cloth with lukewarm water to remove any residue and let it dry. Prevent the painted fabric from dry cleaning as it might destroy the print. However, not all types require heat setting, so make sure to read the product description beforehand.