I don't bother spraying them. Whether they are laminex or timber or whatever there's a product (at Bunnings) called ESP. Just rub it on with a rag, wipe off and you can then paint any surface. Then use oil paint (turps) and a small foam roller. Sometimes thin the paint just a bit with Penetrol. With a bit of care you get a terrific finish. Plenty good enough for a renter. It's well worth taking all the handles, fittings etc off before you paint. If you can take the doors off and lay them flat all the better. Hope that helps.