He basically was tinkering with silicone coatings since about the same time I was playing with RFID implants… I think since around 2005. For many years they failed… a lot… but I hear from people that failures are more rare these days. What I can tell you though is that only a few years ago I did an analysis on a couple of his mags. I talk about some of that analysis in my “boo hoo no more mags” video;
In short, the material is not robust. It requires a lot of thickness to do it’s job well enough but still there is wear due to it’s plyability and the fact it doesn’t stick to the magnet’s surface… it just swims around inside the silicone. To be fair, nothing really sticks well to the magnets, not even resins… but anyway… the other thing about silicone and how you manufacture such things is that it must be ripped out from molds which leaves the surface all fucked up and ripe for bacterial growth etc.
In general I just don’t like the thickness, the wear, and the surface quality of silicone encased magnets.