You have to spend a few minutes mixing it really well, and then let the purple sediment settle to the bottom before dipping the canopy. I don't scrape the bottom of my mixing container when I dunk the canopy. I assure you there are no "purple blobs" on my canopy, even up close.
Tamiya clear mixes better, but it also dries a lot faster and becomes sticky fairly quickly, leaving less room for error. It works though, if you're not as clumsy as I am and can drain off the excess before it starts getting tacky.