Vinyl is oily. So it's a good idea to prepare the vinyl before painting it. It's not a bad idea to scuff the vinyl a bit using very fine sandpaper or an emery board. Scuff ONLY where the paint will be applied, such as nails, lips, eyebrows. (For blushing you definitely do not want to scuff first. Scuffing is for the detail work only.)
After scuffing, then apply acrylic sealer, allow to dry. Then apply your paint, such as glass paint, or nail polish, or acrylics. Then apply a topcoat polyurethane sealer over that. Be sure to allow each layer to dry thoroughly before you apply the next coat.
Glass paints are good for doing the Reborn fingernails. We have ivory color for that purpose, and a very pale Spring pink. We also stock French color nail polishes. It's important to note that you should use Acrylic Sealer as an undercoat, and Polyurethane varnish as a topcoat. You can also use the Acrylic paints for nail color.
Don't use clear nail polish as a topcoat for nails or lips, because nail polish tends to get "gummy" over time. We recommend using our matte, satin or gloss varnish as a topcoat for nails and also to give a shiny, "wet" look to lips.
The undercoat sealer and the topcoat sealer are VERY important when using glass paint, nail polish or acrylic paints. Please note that the acrylic undercoat and the varnish topcoat are different products.