I have previously wax dipped bottles in a commercial brewery. While I don't have any numbers for you, I should think 5-10g would be plenty.
Some got a thick coat and it was really annoying to open them - had to carve out a groove with a knife before the bottle opener could 'grab' the cap.
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I would use about 1lbs for about 50 bottles, so 5-10g makes sense.
@plactagonic @homebrewing @jason might know
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