I removed paneling from my plaster kitchen walls, and wonder why I have to remove old glue to put up new paneling with new glue. Is this really necessary? Why can't I put the new glue and paneling over the old glue.
Well, if you don't mind the irregular surface, I suppose you could apply glue over the old stuff.
Most of the time they say "remove the old glue" meaning they want you to get a smooth surface. So, sand or scrape it smooth. The remaining glue can stay. It has held this long, and if it doesn't come off the wall when scraping, it will remain.
DISCLAIMER: Check some of the new glue to be sure it sticks to the old stuff!!! (Don't ask me how I know this).
Thank You sir.
BTW, I've found the scraper blade on a MultiMaster to be good for scraping off construction glue. Still tedious, though, and it will gouge a bit.
Of all the preposterous assumptions of humanity over humanity, nothing exceeds most of the criticisms made on the habits of the poor by the well-housed, well-warmed, and well-fed. --Herman Melville