Hello all,
I bought Liquitex Basic Gesso the white one they have black to works like an charm, had tried the white glue method even mixed it with gunze sanyo acrylic colors and some spraycan for softplastic before didn't like it at all so Gesso water and some acrylic color do the trick must confess that I only use Humbrol enamel paints Humbrol and small soft plastic figures is a terrible combo but with gesso it works.
Cheers
Boris