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You want to spray it? I don't have any simple advice for that process except, find someone who will spray it for you, in a proper spray shop. It's very nice when done properly. If you don't really need it sprayed then Zinnser stain seal followed by undercoat and top coats depending on what you want to protect it from. Indoors/Outdoors etc. You didn't give enough information to get a decent answer.
It's a marine ply panel that I'm using to provide a boot floor:
I'm going to stick carpet to the top, but wanted to paint the whole panel black before I did so.
Dammit-
I would use some black stick on vinyl on the underside and carpet on the top. Most paint will just be a liability, potentially marking the carpet. If you roll the sticky backed plastic over the edges of the ply it would be quite nice to handle too. The carpet will move to come undone at the raw edges too, unless it's designed to have loose cut edges.
Airhead
You want to spray it? I don't have any simple advice for that process except, find someone who will spray it for you, in a proper spray shop. It's very nice when done properly. If you don't really need it sprayed then Zinnser stain seal followed by undercoat and top coats depending on what you want to protect it from. Indoors/Outdoors etc. You didn't give enough information to get a decent answer.