Most rust occurs from INSIDE out. The closer the outer panel to the inner one, the worse it gets. ( think Chevy Vega).when its 99% humidity outside in the morning and Not raining, that " mountain Dew" in the air is INSIDE YOUR rockers. Doors. Quarters, truck bed sides, etc. It evaps and then condensate right there in place.
Salt is a huge factor, but humid and temp changes can do a lot mixed with salt.
At my Dealer back in the 70's and up. We used " Quaker Coat" It never really dries, gets waxy. Worked well.
I use fluid film, cosmology, And I bought a whole sprayer set up for WoolWax. This stuff lasts through the car washes. The pic below is a spray can version similar to fluid film. I use a paint gun size unit with 360 degree wands.
Get BETWEEN the rear quarter lips, use cavity wax, or and wand, but its a must. That said, still have put bed sides on my HD. Not rockers though..
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather
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