Over-dyeing with Indigo

Q: I spilled paint on my dress. I’d like to dye it to a nice dark blue. Can I use indigo to dye over everything?

A: I wouldn’t hold out much hope for a natural over-dye solving a paint spill problem as natural dyes won’t bond well to synthetic materials (paint/plastic). Your fabric may get darker, but the places where the paint are would more than likely stay the same color.