Secrets to Painting Cabinet Interiors?

I've finished painting the kitchen walls & have moved on to the next project: painting the cabinets. This will be a slower process, b/c they all need to be sanded b/f painting them. However, I have the first set of upper cabinets sanded & the first coat of paint on them. Question: What's the secret to painting the cabinet interiors? I have tried foam rollers, Shur-line edgers, a paintbrush, and a sponge brush. Not getting the even finish that I am trying to achieve. TY, in advance, for your suggestions & help.
secrets to painting cabinet interiors, kitchen cabinets, painting
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