USUALLY,
If the base paint is in good shape, as in not peeling, chipping or areas of rust showing through, it can be scuffed and shot in the desired color/product.
When you have no clue as to what the paint/product is, then it is best to follow the manufactures advice of the paint you are shooting.
Some will advise to apply a sealer coat/primer, to prevent it from lifting the paint on there now.
If the paint on there is a quality product as in automotive/industrial, not a $1.99 hardware rattle can, the outcome most likely will be good.
If not, it would be best to strip everything and start from bare metal.
Sometimes a small test part/area can be painted with your intended paint and see how it turns out.
There is nothing more discouraging then shooting a beautiful paint and a job you are proud of, only to come back the next day to see it lifting & wrinkling because of incompatibility of products used.
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