Brad, thanks for the offer...you're right, the shipping is the killer. The Calcined Kaolin clay is cheap, there are online places selling it for 2.50/lb but shipping for a pound is high. I've been calling around trying to find a crafts store or an art supply store that carries it locally, but haven't found anyone yet. I've discovered that Glomax (Glo Max) is a brand name for calcined kaolin clay so I'll start looking for that also.
I have about 20 mostly young dwarf citrus in containers, and some of them are heavily infested this year and some not at all. I go out at night and find the mines/instars and rub them out, but with small leaves it takes a very light touch to unroll the tiny leaf and rub out the mines. Most of the small leaves stay soft and flexible, but with some varieties(ie a Moro blood orange) the leaves get stiff and crumbly and break when I try to unroll them.
And even if the trees can survive the infestation(s), they can look so ugly and I really like a healthy looking citrus tree.
I didn't know it took that much (6 cups/gallon) Surround to make a batch. But since I'm only spraying the new very young leaves, I'm not going to use very much of this clay mix, especially since this is an experiment and I don't know if it will even work.
I'll keep looking for art and scupture supply stores. Los Angeles is a big city, there has to be a source somewhere.