jonnieb1962
TF
Hi Johnny, & welcome, as Dave says.If the glue is stiff it'll scrape,though it's probably like
the bitumen stuff used on vynils as you describe it. Just a note of warning,some of these adhesives from the 60s contain asbestos!! On a couple of jobs in the past we were told to not sweep it,only vacuum then have it latexed over as to remove it would have to be done by a specialist. I suppose the safety thing is no dust & quality masks,consider having it tested.The stability is key to your next move.
hi tecnik,
cheers for that i didn't give a thought about asbestos,i've always been led to believe you couldn't latex over vinyl glue,