http://products3.3m.com/catalog/us/en001/auto_marine_ae...eHandler/output_html
Kind of a big link but this is the 3M product called rust fighter. A waxy based product to spray into rocker panels and doors. Applys with a schutz gun (undercoating low pressure sprayer) also has a wand that is 3 feet long for tight places. I used it, and was easy to apply. Thin and self healing if scratched. Your milage may vary!
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