Of course you can paint metal cabinets. Just about any metal can be painted, if you use the right paint. I think your question is, can you paint the vinyl wood-grain that's stuck to the metal? That's a slightly different issue, and it needs a different paint than what you would use on bare metal.
Don't take my word as gospel because I'm not the paint guru, but my recommendation is to use polyurethane paint and polyurethane primer. Since you want it to end up white, first use a dark primer to mask the wood gran on the vinyl sheeting. Then follow with a second coat of primer in a lighter color. Then two coats of white paint.
Make sure you buy a one-part polyurethane paint, not a two-part paint that you have to mix. Interlux makes an excellent polyurethane that they make for painting fiberglass boat gelcoats, but that will also work well on vinyl (modern gelcoat is a vinylester). It ain't cheap, though, so you might want to shop around for other one-part polyurethane paints from reputable manufacturers.
Polyurethane paint fumes are nasty to breathe, so do your painting a bit at a time, not all at once, and use plenty of forced-air ventilation, and take a break if you start to get headaches.
Also check your weather forecast to find out the dew point for each day you're going to be painting, and make sure the temperature where you're painting is at least five degrees above the dew point; this will ensure that the surfaces to be painted are dry.
Polyurethane paint can be applied by brush, roller, or spray. Spray gives the best finish— if you're good at it— but if you're not accustomed to spray painting, stick to a foam roller for large surfaces, with a foam (not bristle) brush for edging and trim work. Use blue masking tape and heavy kraft paper to mask areas that will not be painted, like the cabinet latches.
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