just used a walcom undercoat gun, the back side of the rocker had big enough holes that it could be sprayed in pretty good, 4 on each side too. Didn't have to reduce it but was definitely not shy with it.. I figured this was about the best form of rust prevention i could get. Thin enough to seep down in also.
wondering if i should go back in with the normal rust proofing I use, not sure though as it stays waxy, wonder if that is worse and catches more dirt because of it?