Remove hardware from the wet bar. Lightly sand and remove sanding dust with a box brush. Use a tack cloth to make sure all the leftover grit is picked up.
Mix black gesso (a thick water-based primer used to prep canvases for painting with acrylic-type paints, which remains flexible when dry) with a bit of the green (the gesso is a fancy primer). Apply green paint (this may require two coats).
After the paint has dried completely, varnish with a high-gloss water-based varnish to protect the stencil and give it a modern lacquer look. Replace hardware.