Kaizen foam is the name of a laminated foam product from FastCap, which is marketed quite heavily to wood workers and mechanics. It is supposed to be very easy to cut, and the laminated layers are supposed to be easy to peel to a particular depth. It's also cheap. I am generally not a fan of cutting foam, because I have never been very good at it. But the Kaizen foam got a lot of hype, and it was cheap. I figured I'd give it a shot with some of my AR tools that had been just freely floating around an old Black & Decker plastic tool box for the last decade or so.
I switched boxes to the Rigid nesting box from Home Depot (more on that later). Then I gave a go at foam cutting with all the Kaizen specialty products, including the thin razor and the pattern marker. I found the foam to not peel very easily or controllably, the knife worked great for the first few cuts but dulled quickly, and the pattern marker dried up quick. Peel to depth did not work very well, and once the knife dulled, it was useless. Things look fair to ok with the tools in place, but you can see how badly cut and fitted they are with the tools out.
I had much better luck when I reverted to my old approach of a soldering iron with a piece of #12 copper wire as a cutter. It's how I did my long punches and trigger guard tool:
I think the best thing Kaizen foam has going for it is that it is cheap. Both in price and quality of foam. In my sample size of 1, I found the associated tools and markers to be great for the very limited amount of time they worked. Once I use up the Kaizen foam, I will probably just go back to more conventional foam I can get at my local rubber supplier should I ever find myself with the overwhelming desire to cut foam again.