Do any of the Gurus here have any idea about respirators and filter ratings?

I currently use a Protector Half Mask with a P2 filter when sanding - which is all good, no more sawdust snot.

Of late I have been doing a little bit of airbrushing, mostly artists acrylic and house paint acrylic (don't ask, it's a long anally retentive story).

While the P2 helps (no multi-coloured snot) I am not convinced it is the right filter and the doco I've found is either poorly written and confusing or contradictory.

Any ideas whether P2 is right or if I need one of the P2/A combinations?