Just a tip from an experienced painter that's bs about having to buy skirts already painted from factory, when painting plastics you need to use a plastic primer which is different from regular primer on any raw plastic parts otherwise your paint will definitely flake off, hope this helps you in future projects
Any auto parts store I'm sure you could get it the same place you got the paint your using if you can't see it on the shelf just ask for it, it's a must for painting raw plastic parts, good work hope to see more vids soon