Since vinyl is a form of plastic & bends, I would recommend a paint made to bond with plastic. Rustoleum is made for metal which isn't flexible. But you could always ask someone who knows paint at Home Depot... Ask one of the older employees, not one of the kids working there during summer break. If you want to save money, you may be better off with a high adhesive outdoor primer (like Zinsser 123) then use 100% Acrylic (not latex) paint over the primer. 100% Acrylic is sold in the same area & is made mostly for painting rockery & bricks. It's super-sticky & flexible. Most people get 100% Acrylic mixed up wit Latex. It costs the same & is also available in glossy, semi & matte. Be sure your paint is made for outdoors & has a UV filter!
* If you had aluminum skirting I would use Rustoleum.
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