Hi. We removed carpet from our kitchen floor, and there's black
(adhesive?) and yellow (from back of carpet?) stuff on top of the
original vinyl flooring (most likely asbestos). The black & yellow
stuff is of course hardened and uneven.

We plan on putting new Armstrong sheet vinyl down. Is it possible to
put a leveler and then adhesive on the floor as it is, without having
to remove the old adhesive (and expose ourselves to the toxicity of
adhesive removers like Jasco)? If so, can someone make product
suggestions? Thank you.