Greg
I'm curious, with what are you thinning the MM Acrylic?
Also, I don' think shaking a bottle of MM Acryl is enough. IMO, stirring is probably better. (Sorry, 007)
Sounds like it might be dry tip.
I know your question is about straining and I hope my going off course a bit here is ok.
I agree entirely with Greg, a thorough mixing by stirring the paint in the bottle is really the only way, to ensure complete blending of all ingredients. The amount of solids settling to the bottom during storage is significant, shaking the bottle just can't seem to get it all back into a uniform liquid state.
The bits of unblended paint that are suspended after shaking, I think is what causes the AB to spit and clog. After I completely stir the bottle, I use the little Badger electric mixer to finish the process of blending all ingredients. Then comes the thinning process with whatever else you may add for spraying, finish with the mixer and you're ready.
I realize it adds time to the pre-spraying process, but then dealing with an un-cooperative, clogging AB takes time too. Plus you might be stuck with a less than desirable final finish, due to problems during the spraying.
Just my thoughts.
Patrick