The zinc spray ensures sparing dosage. Brief spraying is enough to achieve a protection film of 20 _ 30 my. AB 31 to AB 38, AB 40 to AB 56, IV 1 to 28, IV 30 to 32, IV 36 & 40, IV 52 to 54, IV63, KW 1 to 14, PA 21 to PA 38, PH 4 to PH 41, PH 49, PH 50.
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