sand blasting

No wonder places like rockers rot out so bad.... If the sand got in (and trapped) when they sit out and it rains water apparently will too. So definitely need to get in there and prime/ undercoat the snot out of those areas while dry. Have to get some of those plugs like ziebart used to have, drill in an inconspicuous spot and spray oil, tar, something like that inside of there ..
Maybe you could drill like that enough to get an air wand in there, blow out and coat then pop a plug in there. Wouldn't be assembly line "correct" but if you do say the back of the inner rockers nobody would see them....
If someone bitches call it a "day 2" mod