by chance did you buy current used up zincs from different place than previously? have found different zinc makers zincs... deteriorate at different rates faster corroding are doing job best as far as protection.....zincs made in china seem to give least protection and in some cases show little deterior change over as long as 3 years not much protection best seem to be those ,,made in canada or usa ,, although cost 10 to 15 percent more ...if actually made in canada will be marked on zinc appears you get what you pay for .
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