Can I substitute LOCTITE 518 Gasket Eliminator for LOCTITE 515 Gasket Maker?
These are both anaerobic flange sealants designed for rigid machined flanges. They are similar products with one of the key differences being that LOCTITE 518 is a better product for use on aluminium flanges. Thus, LOCTITE 518 probably can replace LOCTITE 515 for most applications. However, LOCTITE 518 is generally a faster setting anaerobic and it may tend to cure too quickly on very active metals like brass. In this instance, LOCTITE 515 may be a better choice.