Not sure about the stuff Classic Industries sells because I haven't seen the brand. Dupli Color sells some that isn't worth a plug nickle. Krylon sells some that is ten times worse than the Dupli Color stuff. I have used SEM before and it works very well. I changed the color of a interior on a 1966 Polara convertible from blue to black using SEM paint and it lasted in the Florida sun for over a year which is when I sold the car. I was told when I bought it that prep is the key. They told me to wipe the vinyl down with laquer thinner which opens up the pores on the vinyl. Not sure how true that was but I did it and afterwards I could not scratch it off with my finger nail. SEM is pricey. The last time I checked it was 12 dollars a can.