How can I repair the side edge of kitchen cabinets before painting ?

Margaret: 1. look for source of moisture and fix that first 2. I might use a bit of wood putty -- before painting over them

I would sand the edges first. Then, I agree with the wood putty and then sand it down a little again before painting.

First clean the edge with Dawn and water, let dry completely. Sand the rough edges off, then get wood filler, or Bondo. Apply, then sand it down again to make the edges even. Prime the cabinet side, so no flashing of paint will occur. Then paint.

I agree with Dee. That is the best way to get them ready for a makeover

You are welcome