Quote:What about a heat gun?
probably not. It seems to me it would just make the glue soft and smeary but you could give it a try in a corner.
masonite would change the floor height but I'm not sure what you mean about mucking up the floor tiles. the sheeting is to give you a large even surface to lay your vinyl on. It is usual to remove the skirting boards fit the masonite (removing the skirting means you dont hve to be exact with the fitting) lay the vinyl then replace the skirting.
Newspapers were used at one time to smooth out the lumps, bumps and flooring joints. Put a 3 layers of news sheet down and see how it feels.
Asbestos cemnt sheeting is a possibility as CJ said. It was used here to lay vinyl on in I think the 50's or 60's.