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If you really care about your painting and the impact it has on those who view it you will tackle the inside as well as the outside inmost things your do. It can be as simple as a single coat of colour. You could try a little glad wrap or sea sponge sponging, or use the product called soft flock for a velvet finish in a jewel box. On natural timber items that are to be used to store foods such as sugar canisters, potato bins..these I would leave in their natural state, even though most paint we use is labeled non toxic. Non toxic doesn't mean food safe. Keep that in mind if you choose to paint the inside of these. Read the label!