I went about the job (pleasure, really) of painting VOL (vinyl over luan), plus faux and real wood, as well. Been researching it on the net and found a different way. Instead of oil based primer, it was recommended to use Gripper; a latex based primer from Glidden (Home Depot). You have to clean the vinyl very well; I used vinegar and water mix plus a final wipe with alcohol and sand lightly (don’t break through the vinyl). If you are going with a dark color it can be tinted, which might let one top coat work. I like Valspar All in One, which is self priming, but over Gripper it sticks and holds up very well. Of course, you have to fix any loose vinyl or water damaged wood first and wipe with a tack rag before priming. My 2015 only had holes where I had mounted things (stupid of me). So, I’ll get back here with photos very soon. I’m starting with the toy bay (garage of toy hauler)and all goes well, I will repaint the other rooms. Happy trails, Clint