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The ClueWaxy substance (7 letter answer)
NotesThe answer SEALANT is rarely seen, appearing only about once every 1300 puzzles.
Related CluesAdhesive substance
Substance for a leaky radiator
Leaky radiator remedy, e.g.
Deck covering to keep out moisture
It may be under a coat
DefinitionSEALANT as a noun:
1. (sealant, sealer) = a kind of sealing material that is used to form a hard coating on a porous surface (as a coat of paint or varnish used to size a surface)