A friend put up my overmantel mirror with 'No More Nails' - will I ever be able to get it off the wall?

It's a big mirror - the 'No More Nails' is globbed on the four triangles of hardboard bracing the corner joints at the back of the frame. If I move flat, will I ever be able to get it off (without destroying the mirror?).





I have the idea I could saw sideways through the gunk, releasing it from the plaster - either that or pulling the mirror away from the hardboard triangles. Any advice please?A friend put up my overmantel mirror with 'No More Nails' - will I ever be able to get it off the wall?
as a carpenter i use grip fill, no more nails all the time, often when trying to rip skirting off that is held by grip fill the wood will often break first that's have strong it can be when left to cure properly, however dont panic, im assuming your walls are painted/papered that means the no more nails has stuck to the paint and not the walls often the paint will just come off when a chisel or scraper is placed where the adhesive meets the wall and give it a little tap with a hammer and i guarantee it will come off with no trouble, do not attempt to cut the adhesive because you will be there for hours, hope this helpsA friend put up my overmantel mirror with 'No More Nails' - will I ever be able to get it off the wall?
If the dried glue is accessible to saw, with something like a hacksaw blade flat against the wall, then definitely saw it. It's too dangerous to pull on or try to force a mirror away from the corner braces, as it will probably break. Having a small repair to make on the plaster (after removing the mirror) is inevitable.
Either the plaster of the hardboard corners will pull off when you try to remove the mirror. These corner cutting ideas are ok until you want to move.......!.
EEEK what a nuts friend... why didnt they just put in some wall plugs and screw it up its really easy...





anyway... id say your best bet to get it off would be to saw it like you say.... very tricky thou at that angle!





Or just leave the mirror for whoever moves in to deal with ehhehe and buy a new one.





x
If the mirror is stuck to a painted or wall papered wall, then the fixing is only as strong as the paint / wallpaper glue. Not very strong at all. Will pull off very easily if it does not fall off on its own.