Matt, don't know what different kinds of mastic are used .
I've only used latex (as mentioned, they're not water soluble when cured)
Which it surely is by now
The stuff we've used is more "brittle/hard " than paint and caulk and somewhat "chip offable".
again another WAG, but maybe try to break/crack off as much as possible first by crushing with plirs or vise grips before going for strong solvents/strippers
damn good suggestion Swabby!!
Afro combs would be perfect for cut piles
y'all be cool...right on
..L.T.A.