Synonyms for Mastic:

n.

epoxy resin, fixative, paste, Blu-Tack, binder, adhesive, glue. resin (noun)
bitumen, guaiacum, amber, copalite, pitch, oleoresin, camphor, coal tar, ambergris, chicle, gum ammoniac, shellac, myrrh, frankincense, algin, resin, mineral pitch, sealing wax, gum, rosin, balsam, agar, tar, varnish, gum shellac, lacquer, asphalt.

Other synonyms:

epoxy resin, Blu-Tack, adhesive. fixative, glue. binder, paste. Other relevant words:
fixative, adhesive, paste, Blu-Tack, glue.