What are fixings? Fixing is the term for a tool or material that joins two pieces together. This can be a nut and bolt for metallic elements, whereas for wood, floors and walls sealants are another type of fixing. However there are different sealants for each purpose. 

Hardeners are often linked to wood as a connection but not limited to such.

Sealant and Adhesives will seal all materials and are particularly popular in the boating industry as they can fix damages quickly without water loosening it.