Regarding stainless steel painting
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In most cases, stainless steel products have their surfaces passivated. If the customer requests painting on the surface, is it still necessary to passivate the 304 surface? What treatment should be applied to the painted stainless steel surface? What is usually done to the inner surface of stainless steel?
There are also stainless steel containers that are painted on their surface; for these, a sandblasting material specific to stainless steel must be used for sandblasting pre-treatment before painting. The inner surface is generally pickled and passivated.
Pickling and passivation are required; the surface to be painted must have a certain level of roughness, otherwise the paint will not adhere properly