In addition to ironing, you can also set the Marau textile paint in the oven.
For 8 minutes in the 150°C (= 302°F) oven.
You must let the textile-painted cotton fabric fully dry, then put it into the oven for the final setting.
Using an oven suits well for craft teachers who may have many painted items that need fixing. Ironing would consume a lot of time since you need to do them individually.
Music:
Colour Of Your Face - NoMBe