Crossword clue: a substance for packing a joint or coating a porous surface to make it impervious to gas or liquid

The most common answer is luting (6 letters).

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

luting 6 letters wn-def

a substance for packing a joint or coating a porous surface to make it impervious to gas or liquid