The older plastic or resin Adirondacks need to be brightened up?

Patio Adirondacks that so many of us have.Plastic or resin . Mine is in good shape but need color. either the green is faded and dull , or the tan is dull & stained . what can I paint these with that will brighten up colors. ? orange? lime ? turquoise... And won't chip off ? Help Please
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