What paint to use on a mdf kitchen?

Catalyzed Varnish or equivalent.

It's possible to reface your cabinets, get new doors, drawers, counter top and all new hardware including drawer glides for under $3,000.00.

In the US, an industry standard is two coats of clear sanding sealer, then 2 coats of clear lacquer.

However, many refinishers use an enamel-based paint because it cleans well.