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Polishtradesman
It depends what adhesvie it is. C2 class has got much more chemicals then C1 and these chemicals can be out of date. Another thing is health. Adhesives contain hexavalent chromium which is carcinogen. Standard is not more then 0,0002% of it. Manufacturers use reducers to make low content of this substance. These reducers can be out of date too.
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