Never heard of the brand ’til now – I’d wager it’s similar to the stuff archers use on real feather fletching. Which can be found in archery shops for a fraction of the cost of the fly shop products (Loon Blue Ribbon, etc) IIRC it’s called fumed hydrophobic silica.
I carry a 35mm film canister (remember film? 😉 ) of the stuff and it works well. But treating your flies in the ever-present western wind means a lot of it just blows away.
After reading about the stuff, but not much because of time, it works on CDC as well. It has my attention, but depending on the cost would determin if I buy any or not. Just have to find somewhere that sells it and see.
As for the wind, it’s a problem to consider. But as they say in Washington State, don’t let the rain ruin your day.