3M 4251 Organic half mask.
They are on Fleabay or Amazon.
I put the date on them and throw them after 2 months.
Cheap, easy and I have never had issues with vapour or any dizziness.
Don't forget, the full face air fed stuff is for guys doing it day in, day out who need the protection. We use common sense, do small amounts and take care. Ask the guys who shot paint years ago with a simple dust mask on - Jeeesh !
Also, a lot of the paint or primer we shoot isn't cyano, some is just 1k or 2k cellulose.