Can you sand and paint kitchen cabinets that are not wood?

Lillian, what are they made of? If they are metal, yes, I would try a high number grit sandpaper as it is very obvious when you sand them

My thought is to just buy a great primer to paint right over the surface and then top with your paint choice. Check with a local paint store like Sherwin-Williams (I don't work for them but find them very helpful) to suggest what type of paint and primer to use. Good luck!!

Look into using chalk paint to do your caninets

I have heard that chalk paint in great. I also bought, 15 years ago, a paint specifically for cabinets @ Home Depot. I had to sand the cabinets and then apply the paint with a foam roller.

Yes you can!

Make sure they are clean and dry. Use acrylic latex paint. Remove the doors and hardware. Mark the doors and cabinets with tape where they go. Lightly sand the doors and cabinets to remove any gloss and roughen the surface for paint. Prime with a stain blocking primer like Zinsser 123. Then paint with your color. Seal with at least three coats with a water based polyurethane. Use a small foam roller and foam brush for a smooth finish.

It looks like your question got cut off so it's not showing what problem you're actually having. If the problem is that it's made with MDF or 'particle' board most people say you can't sand it. I have a very old corner cupboard lazy susan that I decided to fix up and paint. The matting I had put down had pulled off and there were bumps everywhere. I just got out a sander and sanded away. When I thought it was smooth I put on a primer. Oops, discovered it wasn't as smooth as I thought - so back to sanding. I eventually got it pretty smooth - there are a few spots near the edge, next to the edging tri that I couldn't get, but they don't show. If that's the problem, I'd suggest sanding, being patient, priming, checking again, being patient. Take a break ;), be patient, sand some more , etc. until you have it the way you want. Prime it, make sure it's finally smooth and paint away. This advice is NOT for wood, veneered, or metal cabinets. It's for the cabinets that get bumpy spots when they get wet made with MDF or 'particle board". You can do it! HTH