All you need is a substrate that has a fine weave to hold the grit, does not have it’s own grit larger than CBN and that can be wet.

That eliminates most conventional substrates.

Good substrates are paper, fine weave cloths and nylon/polyester strapping.

Ken is to my knowledge the only one producing suspensions pure enough for our use.

He does sell them through Chef’s Knifes to Go, as well.

Yes they are pricy, but really for razors all you need is .50um and possibly .125um. One bottle is more than a life time supply.

I have been stropping on one CBN strop for over 3 years with one application (4 squirts).

The biggest problem is contamination, it does not wear out.