I discovered something completely by accident. Using the HF red, black airsoft bb's and a square #5 Ziploc container, I was shaking and just kinda tossed it lightly in the air.
Now when I just shake seņora, the coverage is decent but some bare spots are evident. Lo and behold, after tossing it like a pizza a couple times the bullets were completely coated!
You can hear the bb's pinging off the container and bullets while mid flight, like popcorn. So there you go fellas. Make sure the lid is on tight and don't drop it!