I am sanding down some old kitchen cabinets in a guest house. The house is about sixty years old. When we were deciding what to do with them to spruce them up, we realized that the white paint was covering an older mint green color. We removed the top cabinets for an open shelving look. I sanded down the paint to create white, green and wood layering effect. I have used three grades of sand paper to get it very smooth, but I am still concerned about paint flaking off down the road. We love the look but I want to seal it well so the paint doesn't flake onto plates and food stuffs on the shelving. I don't want a shiny look. What does anyone recommend?