dont add too much at once and make sure to scratch at the case to make abrasion that the resin can grip to

A bit in between. It's firm, but also still has some give in it so you can flex your phone in and out if needed. Another resin video I saw specified to use a resin that doesn't set hard, which I would not have thought of. The one she is using is actually a hard set one, so I would use that one at your own risk, especially if you are covering the whole case like she is. My concern would be that if the case is flexible, but the resin isn't, if you were to pop the case off and on too much (like maybe you want to change cases for looks) the hard resin might pop off the softer plastic....or it might just crack. Not sure, as I have not yet worked with resin yet (but plan to) so this is just a theory in my head. Hope this helps. :)

​@@TheMurlocKeeperCan you indicate a cheap flexible resin that would work well for this type of project? I also bought a hard one

It's not THAT toxic, lol! As long as you have a window open and a breeze coming through a bit, it's fine. If you were working with this stuff on a longer term basis, (like several hours a day, every day) then yeah, I'd be working in front of an extractor fan that's dumping it out the window or something, but for occasional projects like this, it's fine. I've worked with liquid resin for 3D printers, and I've had THAT stuff all over my hands, and I didn't get sick, or sprout any new growths overnight. Live dangerously! :P