I have read before where people used craft acrylics to reborn. I haven’t tried it myself. I agree that artist grade acrylics are better because they have stronger pigments in them. Things to keep in mind are that water breaks down pigment and therefore it is best to limit water to no more than 10 percent of the mix. To further thin use acylic paint thinner or flow medium. You can also add Liquitex Ultra Matte gel to soften the paint pigment colors while increasing the binder ratio in your mix. Like mentioned above, some vinyls do need to be primed to hold the paint better. Lastly, cure time is MINIMUM 48 hours. Acrylics are dry to the touch in about 30 mins, 80% cured in 48 hours and not fully cured for 2-4 weeks depending on humidity levels etc. Before applying sealer, dampen a qtip and rub over the painted pieces to see if any paint color lifts back off. If it does, then it is not cured enough to seal. When sealing, lightly pounce the sealer on with a cosmetic wedge.