Dyeing polyester is a chore. Maybe I can just paint them instead, using acrylic paint.
I could make my own fabric medium (for thinning down acrylic paint) using glycerin, vinegar and water. I have some old glycerin that I wanted to throw out anyway.
This video looks very similar to what I want to try. They came out a bit blotchy but I think that’s a cool look, if I didn’t want that I could wet the fabric beforehand to make the paint stick more evenly.
Would need a hot iron to completely cure the acrylic onto the fibres. Or perhaps an oven, or a blow dryer.
To be continued