Chemical adhesives and sealants may provide added holding force and sealing ability when two components are joined. Sealants are applied to threads where fluid contact is frequent. Chemical thread retainers are either aerobic (cures in the presence of air) or anaerobic (cures in the absence of air). When using a chemical adhesive or sealant, follow the manufacturer’s instructions. Note that some adhesives molecularly bond to the surface of metals, destroying the material on removal. Some can be harmful on contact with skin. In almost all cases, the material safety data sheet (MSDS) for these products is published on the company’s Web site.
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