A couple of problems with aluminum skid plates. One is aluminum's love of disintegrating in the presence of steel. You have to use special grades of aluminun or isolate the two metals from each other. The other is that, in salt land, you can kiss it goodby in about 3 years unless you have special grade aluminum, which will kill you on price. Better to go to steel or, if you can afford it, stainless, 304 or even 316.

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