waterproofer

English

Etymology

waterproof +‎ -er

Noun

waterproofer (plural waterproofers)

1. One who, or that which, makes waterproof.
   • 1985, The Architects' Journal, volume 181, page 65:

     It must not contain waterproofers, integral hardeners, plasticisers, accelerators or other additives because these act as delaminators for resins.