I've seen a few threads espousing Cosmoline 342 for vehicle rust protection. Looks like good stuff, definitely direct competition with Amsoil HDMP that many like. Browsing their website and found they offer both RP-342 as well as RP-342 Black in bulk packaging. Has anybody sprayed this? I'm not sure if its thick enough to use my undercoating gun or if I would need more of a paint sprayer.