As I understand it, technically they are all actually paints, there is no such thing as actual vinyl dye even though that description is used. I thought long and hard about it when I wanted to dye (paint) the rear curtain of my convertible top. After reading a lot, SEM always came out well, but the biggest takeaway was surface prep and the adhesion promotor. Do that right and I think most of the available products will work well. Something to soften the material before spraying it.