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Updating this finish and need to remove this beveled glass that has been resting nicely since the late 80's.
The bumpers have deteriorated and have become gummy imo..
Currently stumped..wondered if anyone has experienced this..

Table is around 42"x42" with 8 bumpers as the rests.

Thanks
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No direct experience, so just spit balling.

Maybe tip it on its side, squirt a few drops of something like goo gone on the lower bumpers. Let it soak a bit w the help of gravity. Then work it with a razor, sharp putty knife, or 5 in one. Roll it to the next side and do the same - x4 sides. Get those old gummy bumpers loosened up. If you don't have a helper, have it tipped up close to a wall or something so that if it ever does decide to just pop it can't just fall right out and splat on the floor.

Short story? I'd probably just go low and and slow. Patience, a little solvent and and little coaxing.
 

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“Should” be tempered glass which is pretty tough stuff. If not, and it does break, it is relatively cheap to replace, bevel and all. Other than that, Joe has a solid plan, except that I would also secure the glass in place by wrapping the top of the table with a few go arounds with some of that plastic packing tape stuff before turning it on it’s side.
 

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If it does break it can do so in an explosive way! I had a "tempered glass" table top "break" once and swore off ever owning glass furniture again. Tempered glass may be less inclined to breakage but it does shatter and when it does...
If it were my problem I'd get some help and turn the table over, glass to floor. place some spacers under the metal edges. Be patient and let gravity do the job. (You need an assistant to help you turn the table over, it's dangerous as a one man job.)
 

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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.
 
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