Sand it lightly with fine sandpaper so that the paint will stick. dust off and carefully tape up any bits you don't want to paint. Buy some spray paint in the colour of your choice and spray light coats, layer by layer, allowing each to dry until you get an even colour. it'll look a little patchy at first but you will lose that with the other coats.
Maybe someone else has done this with a brush or roller and will help.
Or if you find a nice fablon you could use that
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