Drilling into glass would make me SUPER nervous. I think I'd pad mount with silicone, and make the client aware that I may need to come out every year or two to re-mount letters
I was simply referring to the bonding to the glass....And if it's the type of glass block I'm thinking it is, there is not a smooth surface...
what about temperature change with the VHB tape and silicone. It could reach high of 95 and down to -15 here.....
IPS makes weld-on -- an acrylic to acrylic cement...just get some GE1200 silicone (gemini sells it, but so do most paint/hardware stores
the lady from IPS told me that they have nothing to work with glass though ... or is this GE1200 silicone from someone else??
tabs of thick double-sided tape (thickness is KEY), VHB thickness being a minimum. And smears/dabs of 100% silicone caulk between the tabs.
If you use thin double-sided tape, you spread the silicone too thin and its worthless.