That's encouraging news B_B!!
So the secret is probably to shake the can for an abnormally long time after being warmed up for a few hours in sunlight.
Will you try this on one of the blocked our partially blocked cans, presuming you can restart one?
Must see if it works on another.
Ten minutes is a long time but better safe than sorry.
I wonder if you could use a stop watch and do a total of ten minutes with time out as long as the total shaking time adds up to ten minutes?

So glad it worked for you. It's a beauty of a colour for SB restorations or refreshment of appearance. They need to keep making it!!

Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!