When I worked in the ATM industry we already had that feature built into the keypad (EPP). If you tried to extract the keys any number of ways (freeze spray, remove back cover, cut front cover, etc.) it would dump the memory and leave the attacker with nothing. All you have to do is contact one of the companies that built those EPP's and they can guide you into a LOW COST hardware method of dumping everything. You don't need to go with a fancy "custom coating" that might fail or have alternative issues. I would not buy this phone as it is over-priced, and I can do the same thing with a common android smartphone and a little software and hardware tweaking. Epoxy is your friend for keeping people out of things they don't need to see, as is encryption with delete upon failure to decrypt. What a joke, but they will sell a bunch of them to Gov. and "special" people.