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Originally Posted by JRMichler

Around here, they mix salt with sand. The sand/salt mixture gets thrown up and collects in every possible corner, crevice, and flat surface. The salt is hygroscopic (not hydroscopic), so the mixture will make rust all year, even in fairly dry weather.

Once that rust gets underneath undercoating, it spreads fast until the undercoating is just hanging there.

Somebody fit a belly under their truck by fastening Coroplast to a square tube framework. I'd hate to put something like that in, then watch it fall off from rust in 3 or 4 years.

Fixed yer post...
Hygroscopy - Wikipedia, the free encyclopedia