Old time bodyman I know that worked at an Olds dealer when these were new cars told me the aluminum was just whatever they could get, and is hard to weld due to the unknown content. Kinda like the red iron in steel buildings, i guess...sort of a free-for-all on what goes into the smelter.
i know this is an old thread but i have an alum. support that i had glass beaded,i water washed it,clear coated it(light coats)with rattle can,its benn on over a year,still looks like new,
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