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The best type of paint to apply to stainless steel is epoxy paint. This material is also popular for painting over concrete and other floor surfaces because it creates a tough, durable surface. Keep in mind that the epoxy paint curing time is three to seven days, but refer to the manufacturer’s instructions for specific wait times. 

Enamel paint is typically an oil-based paint, but some options on the market are water-based. Water-based enamel paints tend to dry faster, in less than 8 hours, while oil-based enamel paints may take 24 hours. Oil-based enamel tends to be more durable and retain its shine for longer than water-based enamel paint.

Yes, primer is an essential step for preventing rust formation on your newly-painted metal surface. Additionally, primer can help the paint stick to the metal better and can slow down the formation of rust if you buy a rust-inhibiting primer. Just be sure to avoid water-based primers, which aren't made for metal surfaces.

You can technically just paint over hairline cracks in plaster since these cracks are often harmless, but this will mostly be a waste of paint. Paint will only hide the hairline crack for a few months before it shows up again. The best solution is to repair the crack with flexible filler or joint compound before repainting.