Sorry to hijack this. A few questions to those of you have been using magnets:
What sort of size/strength magnets are you using?
Have you had any issues with models being pulled towards each other etc when playing games with them?
I've noticed in the links some options show models upside down in trays to add more space - possibly obvious question but will there be polarity issues with this if using the same shelf from above too?
For 32 mm diam GW bases the underside has a ca 2.5 mm depth, which suits cylindical magnets fine as long as their length is 2 mm regardless of the diameter of the magnet.
Cylindical magnets that have their poles on the flat sides have a much stronger pull force along the cylinder axis than along the radius, therefore with weaker magnets a bit heavier models may move along the metal sheet they are stuck on, basically they are prone to slide on the sheet if the bag/box/sheet is subject to sudden acceleration/deceleration along the sheets plane. So therefore always go for the stronger magnets even if the weaker ones give suffiecient adherence perpendicular to the metal sheet.
So, I tested with 6 x 2 mm cylinder magnets with N52 strength and with one magnet, a resin 30k space marine on 32 mm base and they have been fine dropping the bag on the floor from 1 m height. I marked the metal sheet around the base edge and observed after the drop that the model haven't slided along the sheet eventhough the bag rolled after dropping. So I recommend 6 x 2 mm magnets of N52 strenght, get a pack of hundred (or two hundred depending on army size) because you will need multiples for larger models.
If the model and the base are resin and extra chunky, like the 30k forgeworld character series models, then put several magnets on the underside of the larger scenic base agains the sheet and put two on the underside of the 32 mm base against the scenic base.
I had no issues with models pulled towards eachother during games just because of the weaker radial pull force of cylindrical magnets (the strong pull is axial).
I too don't recommed to put them upside down due to reasons mentioned in above posts.
Edited by Imren, 14 October 2020 - 12:29 PM.