Use an enamel or oil based paint and you should be fine.

There is a clear sealer for them that is probably oil-based that I used but I cannot remember. I do so much stuff, it is hard to recall but ask at your paint store and if you used oil paint, tell them. If you used latex, also tell them that as you will need to have two surfaces that can bond to each other.

Might also ask the experts at the Paint Forum here at GWeb.

You can paint over them with any type of sealer like a poly or shellac or varnish. That will protect them.

I'm curious....did you prime before you painted and what type of paint did you use? We have the cheapy faux wood cabinets and I painted those four years ago this week. I primed and then painted with three coats of semi-gloss from Wal-Mart. They aren't peeling or scratching at all. I painted the bathroom vanity and laundry cabinets in the same way and they're fine, too.

I know this is an old post but I could not help but notice that they we going to use Latex on their kitchen cabinets. This is not a good idea for kitchen cabinets this meant for walls only or trim but knot cabinets. If it is too late and you want to still protect the finish you can try coating the white cabinets with a clear non yellowing water base catalyzed conversion varnish. We have a small finishing shop that does high end finishing for number of cabinet shops. One product that I would recommend to go over your existing finish is ESC coatings CON-Var Clear finish this is a catalyzed conversion varnish water base finish which pretty fairly easy to spray and it adheres very well to existing finishes. It is water resistant and does not yellow once catalyzed. Check out

https://ecostepscoating.com/. Another tip would be to also add more protection in problem areas such as the sink doors and the trash pull drawer https://www.youtube.com/watch?v=9Vc3LT5EVDo these areas will need something extra to ensure minimal damge can occur over time check out https://www.cabinethero.com/