Polymark Fabric Paint

I painted something on a shirt a few years ago. I would keep the shirt, but I do not like what I painted over. Is it possible to dissolve the paint or something like that?

Not since Polymark is a trademark of * permanent * acrylic paint (after drying).

You can, however, something of paint on your original paint, or use your painting as a background or framing element behind something new.

Or you could make something out of fabric (or anything washable) you could then sewn onto the old paint (... For example, a block quilt, appliqued, "or simply fabric with new paint on this --- if it is a painting, or simply paint randomly, stamping, painting random thread "," drawing with bleach Soft Scrub Gel, etc., etc..)
If you do this, you can simply run on the banks of the new fabric, then sew around the outside near the edge (or make a satin stitch "with a sewing machine), or" tie "on it with ties in various fields, or perhaps just use glue or fusible webbing fabric to hold it.

HTH

Diane B.