With hard chrome plating the use of a skirt with a flexible PVC liner is always recommended. When using a Koroseal PVC skirt thicker is better, but there is a limit as to how thick that skirt should be.
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Hard chrome plating solutions are notorious for breaking down tank liners at the area where solution and oxygen interact. This is because as the solution evaporates the fumes condensate back on the liner. That condensate is now at a concentration of chrome beyond which PVC can handle. This causes the liner to break down at this area while the rest of the liner that is under solution still has years of service life left.
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