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Registered
Join Date: Jun 2000
Location: Northwest PA USA
Posts: 1,899
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Because after 40 years, the metal has oxidized and is not as flat and even as when first manufactured. The sealer will help seal the irregularities caused by wear and oxidation over the years. The alternative would be to machine mating surfaces flat again...
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'88 Carrera
Guards Red
'70 VW Beetle
Yukon Yellow 
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