Light oak formica table top can it be painted to a darker color?

Make sure its are clean and dry. Use acrylic latex paint. Lightly sand to remove any gloss and roughen the surface for paint. Prime with a stain blocking primer like Zinsser 123. Then paint with your color. Seal with at least three coats with a water based polyurethane. Use a small foam roller and foam brush for a smooth finish.

Yes, yes and yes. If you are wanting more than a single-color top, get a couple of similar colors and wet-blend (use another brush to blend the colors slightly) them for a cool, professional look.

You could also try the Rustoleum product designed to be used on plastic outdoor furniture.