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Depending on how much weight it has to bear, silicone, cyanoacrylate (super glue) or epoxy. If the granite is sealed, it could affect the bond strength. Test in a small inconspicuous area first, for bond and staining.
Well, I know that's not a "House" topic (sorry Mod), but in lack of right forum, I will say it's about putting a brass medallion on a granite gravestone. The medallion is the size of a deck of cards, just oval, and much thinner. The original, from 1919 was stolen, sadly. So, I am looking for a great bond. A small tube of the glue would be ideal. Medalion
I have used the 2-part epoxy that comes in a double barrel syringe for similar applications and it held up very well.
Thant's the only way to go. I work with epoxys routinely and if you want a long term durable bond, epoxy is a must.
Trick to this is to have rough mating surfaces. Epoxy does not like 2 things:
1. oily surface
2. smooth surface.
Rougher it is, better it holds. So you want to outline where the medallion will fall onto the stone, then take something like 60 grit sand paper, and run it inside that outline, staying away from the edge, so that it does not show.
Roughening bronze is easier, as you have better access to the surface.
Once roughened, run denaturated alcohol or other degreasing agent on those surfaces and from that on, you MUST wear gloves to not transfer oil from skin onto the surfaces - and epoxy onto your hands.
Any epoxy you buy in a regular store has long cure time, so it will tend to droop down a vertical or inclined surface.
Unless you are working with horizontal surface, my suggestion will be to create a dam out of painter tape, along the medallion lower edge, with tape sticking away from it a few millimeters. Then place epoxy - depends on the medallion size - into its center, and make it roughly half of the inner medallion circumference. Then, when you press it onto the stone, it will spread and fill more of the mating surfaces.
Tap tape into the stone and use something like a dull pointy object to work it well where metal touches stone. So just in case epoxy decides to droop down, it will be stopped by tape.
It is,otherwise, very hard to clean epoxy streaks later. Easier to secure epoxy in place.
I can mix what we call "hot mix" with filler that will harden in seconds or, use Fabtech 25 second epoxy. That thing is DONE by the time you press it on. And HOLDS.
So, after epoxy cured, remove tape and run bead of clear silicone sealant along the edge. To prevent water from getting inside. Wipe off with wet clothe or paper towel. Done.
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