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Refinishing an art table: What do I need to apply after paint for a smooth coat? - painted table top surfaces

I finished an old art / drawing table. It rolls, so I paint what Mrs Lowe's said, and bought an oil-based primer. I sand the surface enough to beat him, then apply the primer, followed by several layers of black paint. But today, the table surface is still rough sand.

I also decorate the table with a few stamps. What kind of product I should apply for the smooth surface, and then more serious sticker will bleed me the gentle needs of dishes and do my stickers and bubble?

Thanks in advance!