I find on many vinyls, even some water based paint is a problem.
However, I have used Testors Dullcoat lacquer works on many acrylics when they are completely dry. I know this shouldn't work, but it does. I wonder if that stuff dries so fast the paint doesn't have enough time to be bothered. Try a test by painting a piece of scrap with the paint, letting it thoroughly dry for a day or two, and then try the spray can Dullcoat on it. Again, a quick, dry coat.