I am struggling with painting the Lightning as the paint is not sticking to the plastic.
it’s not so common now, but some older kit manufactures (Matchbox is a good example) used a moulding release agent, if the kit’s been sitting around for years, the styrene will absorb it over time, and you’ll never get it out totally, so it may need a coat of primer. Most people will tell you to wash kits before you paint them, I never do, and I’ve never had an issue.
Primer: Like Roackhopper, unless I’m black-basing, I don’t generally prime my kits. I’m not competing or publishing on you tube, I build for my own enjoyment, so who cares?