[epicide]

Resins aren't always perfectly still when curing. Especially if you need large volumes of the stuff. Not to mention, time becomes a factor pretty quickly. The faster the cure for the resin, the more exothermic it is (along with higher risk of thermal runaway), which increases the chance of shifting.

Not to mention, you'd also need a really effective solvent for resin that doesn't also happen to be a solvent for whatever the mosaic is made of. Perhaps the mosaic is made of resin beads.

All that being said, it's virtually guaranteed that a valid attack on these methods exists. There's no such thing as perfect security. It's always a case of evaluating your threat model to make security attempts that thwart a constantly moving array of types of attack.

[whamlastxmas]

I'd go for injecting non-electrically conductive liquid that can both freeze and evaporate, freezing the liquid, remove electronics, tamper, replace, pull a light vacuum and air to remove liquid/allow evaporation