yes, I've done that a couple of times but it wears off quickly. Would it help to put a coat or 2 of poly on it?

I've done that a couple of times

You have done what a couple of times?

You have matching finish? What is it -- exactly?

It takes sanding, and it takes a top quality primer, and then some of your paint. No, I wouldnt put poly on it. Your cabinets are just showing 10 yrs of wear. Just quick touch ups wont do it. You need to clean those doors good, and sand them good, and put a good coat of sealing bonding primer on them, and finally 2 coats of paint on those areas, feathering into the original.

I've sanded down the areas where the paint has either worn away or chipped off, put Kilz primer on, put several thin coats of matching paint on. I'll take another stab at it. Thanks for the input!

It's a high wear spot. This is one reason painted cabinetry is challenging. White kitchens cost more because they dip doors in a coating to prevent this wear and tare. You might try a 3M product made for cars, Paint Protection Film.

Make sure the kilz you are using is a sealing bonding primer, so the paint adheres good. Its also important to follow the directions on the can for recoating.

Thanks so much everybody! I knew I needed more experienced DIY'ers to weigh in.

Read the Guides in the Kitchen Cabinets Painting Experts group on FB. That whole, Clean, Sand, Prime, Paint process is required, even for "just" a touch up.

great tip! Thanks

Painted doors are challenging, but even wood doors often show some wear and tear around door handles and certain cabinets (sink and trash cabinets) that seem to get more use/abuse.

If I was able to get a nice match doing what you are doing, but kept the same spots kept showing wear and tear I would

1. make sure I am using the appropriate primer and that the wood surface underneath is perfectly dry - take the cabinet doors off and move out of the kitchen for a few days, use a heat gun for 5 minutes at a time several times a day - not hot enough to scrape paint off, but enough to help make sure the wood is good and dry.

2. spray 2-3 layers of polyurethane clear coat over the repair.

After you have repainted:

If the only doors that show significant wear and tear are the ones under the sink, consider moving the most-used stuff under the sink to a different cabinet or two, like you would if you had to keep things out of reach of a toddler. If you keep a trash can under the sink, try putting a covered one out on the floor instead.

Or empty the under-sink cabinet out completely. It may seem like a drastic change to our habits, but using other cabinets does spread out the wear and tear considerably.

You can also buy backplates for your knobs in a matching finish for $2 or so. They will take the brunt of fingertip wear and tear. Examples:

https://www.homedepot.com/b/Hardware-Cabinet-Hardware-Cabinet-Backplates/N-5yc1vZc2a2

Be care of applying poly over your repair. It will make the repair look different from the rest of the doors. If you decide to do that, then clean all the other cabinet doors and poly them too, so they all look alike.