I have found these wonderful M. Graham non-toxic oils paints. They are made with a natural Walnut Oil. Check out his site for more detailed information.
I finally broke down and bought some to try. I have to tell you that I love them for Reborning. I have been using them for the base coat. They actually tint the vinyl and leave very little paint behind, and therefore they dry rather quickly. They soak in and become a part of the vinyl.
The cure time is still 4 to 6 weeks, but can be handled the day after painting. No oven is needed and there is absolutely no fumes or smell. These paints cure by oxidation, not evaporation.
To make them dry faster I use a walnut oil alkyd which is also non-toxic.
I know Oils are not the thing to do now days but the beauty, and translucency of the finish is well worth the wait.
These paints are made in the fashion that the old masters did in the Renaissance era. Oils have been tried and tested through the ages, so I know these paints will last for many generations.
These paints are rather pricey, so great care must be taken to mix them carefully and use only the amount needed.
The pics were taken the day after the application of the base coat.