That was indeed me. The ghetto pedalboard project.
I bought one of these
HEJNE Shelf, 303/8x181/2"2 pack (77x47 cm2 pack) - IKEA CA
and spray painted it neon yellow. No priming or anything - it was done to be fast and cheap. Cables can be routed underneath. Velcro glued to the painted surface.
By no means is it road ready. It is just a means of organizing for static use. My brother used the spare shelf from the two pack for the same, however he cut it to be less wide and raised it so that the power supply could go underneath. I think he did two coats of paint.
Pros - inexpensive, sturdy
Cons - probably not road ready
edit - it appears your primary concern is painting. The wood is very porous, so applying a primer is important if you want to cover the wood. But is optional if you don't mind grain showing through.