the grooves still show up with painting. But a sheet of cheap paneling and experiment with it.
You know the drill for prep painting of paneling, 1 wipe down the paneling with vinegar and water 2 use medium/fine sandpaper and scruff up the paneling. go in one direction, should be downward. 3 apply several coats of primer. more coats with light coverage is best. 4 Apply two to three coats of finish paint. I prefer to use latex on both coats. Use only quality paint from a Paint Store.