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For dealing with solvents, you will want a charcoal filter as opposed to a particulate filter. The charcoal ones filter particulate as well...but they are much more expensive and as soon as you open them, they start to loose effectiveness...so you will not normally want to use them for sanding.
The regular P100 filters are fine for resin and cheap. It is favored by drywall hangers and can deal with pretty much any dust resin sanding will generate.
For solvents, 60921 for most hobbyists is fine. It has a built in P100 filter and they are not horribly expensive. Keep in mind though that they do have a limited shelf life, and it shrinks once open. If you are concerned about the vapors, read the documentation on the 3M website and follow it.
If you do a lot of airbrushing with enamels, consider investing in a fume hood style airbrush booth or a supplied air respirator. Both are pricey options, but eleminate the need for replacement cartridges...so if you were like me and going through several cartridges a week, it actually paid for itself in a short period of time.
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