Question on using Appliance Epoxy Spray Paint

I have a variety of candy's I want to restore away from a yellowed plastic state. Currently I am restoring a Net City. I am just curious. Do I sand and primer the plastic before using this stuff, or just throw it right on there?

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Ideal for refinishing exterior metal surfaces including refrigerators, dishwashers, laundry machines and more Epoxy formula creates an ultra hard,

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Rust-Oleum American Accents Stone Spray creates the natural look and feel of stone. It provides a long-lasting decorative finish on a variety of surfaces. For best results, first apply a base coat that blends with the stone finish and add a protective top coat following application of stone finish for maximum durability.

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Have a question about Rust-Oleum Specialty 1 qt. Appliance Epoxy Gloss White Interior Enamel Paint (2-Pack)? - Pg 2 - The Home Depot

Krylon Appliance Epoxy Gloss White Spray Paint (NET WT. 12-oz) in the Spray Paint department at