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I am trying to laminate together two sheets of glass of 6mm (~ 1/4") in order to have a thicker glass plate that will serve as a backing plate for sandpaper in order to flatten stuff (sole of hand planes etc.)

What would be the best glue to use and are there significant tips on how to best achieve this glue-up?

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    Just buy a scrap of thicker plate glass, or granite countertop scrap. If you glue two thinner sheets together, you have to make sure that the two rather more flexible sheets do not bend during gluing and yield a non-flat result.
    – Ecnerwal
    Commented Nov 28, 2021 at 21:54
  • Go to your local scrapyard, and buy a flat piece of car window glass - flat, and a lot safer!
    – Tim
    Commented Nov 29, 2021 at 12:42
  • Not all car window glass is flat @Tim. Do be sure to bring a straight edge to make sure you get something that actually is flat.
    – FreeMan
    Commented Nov 29, 2021 at 17:27
  • I'd like to introduce you to Woodworking. If you care enough to flatten your hand planes, you'll definitely want to stop by there! Loads of great info.
    – FreeMan
    Commented Nov 29, 2021 at 17:28
  • @FreeMan - Well aware of that. That's why I used the word - flat. Wouldn't be valid otherwise! Still a better bet than the original idea... However, I find that the surface of any of my benches is flat enough by itself not to need any of that palaver.
    – Tim
    Commented Nov 29, 2021 at 17:55

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I'd suggest just using a thin layer of silicone sealant. Once in place, it will be almost impossible to separate the sheets of glass again. Just make sure your glass is clean and dry before gluing together.

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  • Silicone holds aquariums together pretty well.
    – blacksmith37
    Commented Nov 28, 2021 at 21:58
  • @Milwrdfan: regular silicone sealant woulnd't it be a little thick? Would it be better than CA glue (such as "superglue" and other commercial names)?
    – Andrei Rînea
    Commented Dec 1, 2021 at 22:15
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    @AndreiRînea, you'd probably want to spread on a very thin layer very smoothly, and then weight the two pieces together. I'd be concerned that CA adhesive wouldn't be able to get good adherence to a smooth glass surface.
    – Milwrdfan
    Commented Dec 2, 2021 at 14:55

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