Here's what I did. Keep in mind, I've never painted anything before. I have a bare piece of plywood. I didn't think I needed primer so I sanded with 100 grit and just spray painted the whole thing black with 2 coats. I let each coat dry for 24 hours. Now the paint rubs off on my hands whenever I touch the painted wood. Someone told me I should spray some kind of sealer over it. (They suggested hairspray, or other). Someone from Home Depot said that I should've primed the wood and that's my problem. What do I do now? 1.) Do I sand off all the black paint, prime the bare wood, then spray paint it black again? 2.) Do I just spray primer over the black paint(already on the wood), then respray paint it black? or 3.) Do I seal it with a sealer or sealant?

I've searched the posts and can't find the answer to my question. I have MDF baseboards already primed. I plan to use latex paint and am trying to determine type of paint to use (flat, semi-gloss, low-luster) on the baseboards. Any help is appreciated! Mike