During a recent remodel of my restaurant we painted the inside of a small ice cream freezer. how do

I'd use paint stripper to get rid of the paint and then, if you really want the freezer to be a different colour, use food dye to colour it. Those dyes are safe for use in food so are safe to be near it and are designed not to leech any discernable flavour or odour. Or you could line the freezer with paper or cellophane.