I recently came across this exact problem with a glass top “welding“ itself to the clear 3M Bumpons. So much so, that I was able to lift the entire coffee table by lifting by the glass alone.
I released the glass with the application of heat.
I went with the ”safe” method, using a hand-held hair drier aimed at the glass where it met the Bumpon. I propped up the hair dryer with a plastic tool box I had on hand and left it for about 10 minutes. I was then able to lift the corner and I slipped a piece of paper between the glass and the bumpon to make sure it would not re-weld itself.
I did the same with a second corner, and when I lifted the glass for the second corner the other two let loose too.
Much quicker, but I considered unsafe:
1. Heat gun. I was afraid that the heat disparity in heating the glass quickly in one corner might cause the glass to shatter. If the glass is tempered, then it would turn to tiny pellets. I was also concerned about the heat affecting the nearby finish.
2. Household iron (clothing iron). This seemed like an attractive option. Set on a very low heat and left on the glass, it should work and is probably safe for the glass and the finish. It requires no machinations to prop it up like the hair dryer would. I still was worried about the glass cracking.
Summary: Heat is the answer. How to apply the heat is the question. The hair dryer worked and required 30 minutes of time (unattended).
The iron used on a low temperature would probably be OK and also would require no attention and probably about the same amount of time.
The heat gun would probably work, and because of the higher heat output would undoubtedly be faster, but in my opinion is fraught with risk to both the glass the the adjacent finish. The temptation is there—I think most of us have a heat gun in their tool box, and are less likely to have a hair dryer or a household iron with them, though both are probably available somewhere at home.
