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Answer for the clue "Varnish or Viagra, perhaps ", 8 letters:
hardener

Alternative clues for the word hardener

Word definitions for hardener in dictionaries

Wiktionary Word definitions in Wiktionary
n. 1 One who, or that which, hardens. 2 A chemical substance added to something in order to harden it; used especially with paints, varnishes and resins.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Hardener \Hard"en*er\ (-'n*[~e]r), n. One who, or that which, hardens; specif., one who tempers tools.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1610s, from harden + -er (1).

Usage examples of hardener.

The intertidal sponges grew like violet shadows, crowding together and absorbing the light with their pigments, the same way they absorbed the hardeners they were fed.

Chlorine, of course, but also bases, stabilizers, softeners, hardeners for when the softeners were too soft and even materials to make the water more "slippery.