Jim-- the normal green, purple, and blue carving waxes we all know
and love, as well as Kate Wolf’s gold and silver carving waxes and
some of the new milling waxes are not generally injectable-- too
viscous, not fluid enough + too hot a melting point. Some of the
injection waxes by various manufacturers are touted as "carvable"
although they’re not in the same league are regular carving waxes–
you might try the Rio Grande blue carvable wax, 700-245/5.