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I've ordered all the materials, I just need to choose the glue. I'm mounting magnets to mostly 25mm bases with old metal Battle Sisters on them... so not so big, but definitely heavier that plastic. They'll go on my new BattleFoam Magna-Rack shelf system. What's the best adhesive to hold up to a little bit of force and regular use? Gorilla Glue? Something else? Any cautionary tales before I embark on a project of mounting 100+ models? Thanks!

Epoxy, like an araldite.
If they are normal "slotta" bases, fill the space around the magnets with the epoxy and let it cure.

Just don't leave them in a hot car. Epoxy adhesives exposed to heat for an extended period will break down and "crystallise", flaking apart.

Take a ball of Green Stuff, put it on the bottom of the base. Shove your magnet into the greenstuff, so that it's still sticking out over the rim of the base. Set your base down on a lightly moistened surface and push down firmly so that the magnet is flush with the rim of the base. Then pull the base off the surface and set upside down to dry.

This generally holds, but sometimes it does lose cohesion. A drop of superglue will fix that. Or you can put a drop between the Base and the greenstuff, and then add some thin superglue to the magnet- greenstuff crack after you have it in place.

This approach maximizes the adhesion between the magnet and the steel sheet, since it minimizes the distance between them.

Jb weld

I mix different adhesive, the usual superglue tends to be fragile and the small shocks anytime you attach a magnet make them break (I'm speaking about big magnet in my Knight, so the issue is amplified).

I usually put them in place with superglue, then when solid add additional adhesives (don't know what brand is available in your country, but the wood/multimaterial glue with long drying time is ok) and sometimes even greenstuff on top of that.

You need a mix of a strong glue and a plastic/gummy one to absorb shocks. This way they should last indefinitely

(I started gluing this way after some trial and error with my neodim magnet of half a kilo each ^^)

I've done superglue magent to plastic, then greenstuff over the top.

Hot glue. Place a bowl of water nearby.
1. Apply dot of hot glue.
2. Place magnet in glue.
3. Dip finger in water.
4. Push excess glue from around the magnet up and over incasing it.
5. Place base down on level surface to allow magnet to settle for best connection

I back fill my bases with epoxy putty, Milliput or Green Stuff, both work great. Embed magnets at the same time and it'll hold up pretty much forever. Provides a much bigger adhesion surface than trying to glue the magnet in by itself.

Great responses, many thanks to all. I have both hot glue and epoxy on hand, so I should be good to get started.