To paint over ANY surface, without sanding, use a product called 'ESP Easy Surface Prep', available at hardware and paint shops. Wipe on, wipe off and paint in 90 minutes. Works well over enamel paint , without having to sand.
Painting a kitchen table can seem a little overwhelming at first, but its actually pretty simple. With all of the flat surfaces on a table and no drawers, its pretty straightforward. You can use latex paint to paint a kitchen table, just make sure to do a few coats of a clear finish on top for extra durability.