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Answer for the clue "A substance for packing a joint or coating a porous surface to make it impervious to gas or liquid ", 6 letters:
luting

Word definitions for luting in dictionaries

WordNet Word definitions in WordNet
n. a substance for packing a joint or coating a porous surface to make it impervious to gas or liquid [syn: lute ]

Wiktionary Word definitions in Wiktionary
n. lute (a kind of sticky clay or cement) vb. (present participle of lute English)

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Lute \Lute\, n. [L. lutum mud, clay: cf. OF. lut.] (Chem.) A cement of clay or other tenacious infusible substance for sealing joints in apparatus, or the mouths of vessels or tubes, or for coating the bodies of retorts, etc., when exposed to heat; -- called ...

Usage examples of luting.

All the joinings must be luted with the Philosophical Luting, and as the spirit comes, so regulate your furnace, but do not let it pass the third degree of heat.