sealant vs sealskin

sealant

noun
  • A mixture of polymers, fillers, and pigments used to fill and seal joints where moderate movement is expected. 

  • Any material used to seal a surface so as to prevent passage of a fluid. 

sealskin

noun
  • Any fabric manufactured to resemble sealskin. 

  • A type of fabric made from the skin of seals. 

  • An item of clothing made from sealskin (whether real or imitation). 

How often have the words sealant and sealskin occurred in a corpus of books? (source: Google Ngram Viewer )