Is it ok to have a thin layer of that adhesive/glue on the foundation prior
to vinyl floor installation? I've used a big scraper to get off alot of it.
Theres still a thin layer though. Its mostly level with the foundation
right now.

Just wondering if they'll give me crap about that before I call them to give
me an estimate on the price of the flooring?

I was thinking of trying really hard to get arid of all of it... But I hear
adhesive remover , floor sanding , and floor grinding sometimes will still
not get arid of all of it. None of which I have tried yet.. and not really
wanting to waste my money on it.