My ‘17 Sonada trunk lid became severely sun damaged / oxidized /faded . I tried to bring it back to life but the paint is too far gone . The Sonata trunk lid is fiberglass / plastic and I am wondering if I can just lightly sand and use the correct color spray (masking off the trunk lid) thin topping with clear coat OR do I need to use a primer first ? Again. It’s just the entire trunk lid (fiberglass /plastic piece) that deteriorated faster than the body paint (which is still in great shape). Thsnks in advance for tips !