Hi @NBlair,
When you are working with an oil-based primer, you'll want to protect yourself from both the solvent vapours and the fine paint particles that come from brushing or rolling. The most important part of the respirator is the cartridge type, since ordinary dust masks do not filter out the fumes that oil-based products release. You want something that handles organic vapours along with particulates.
A good setup is a respirator that uses organic vapour cartridges combined with a P2 or P3 particulate filter. These are usually labelled as A1P2 or A2P2 depending on the capacity of the vapour cartridge. The A rating deals with the solvent fumes, while the P rating looks after the paint mist and airborne dust. Most people painting with oil-based primer at home use an A1P2 or A2P2 half-face respirator because it gives the right balance of protection and comfort for typical DIY sessions.
Both the 3M Multi-Purpose Quick Latch Respirators With Cool Flow Valve and 3M Medium Paint Project Reusable Half Facepiece Respirator are suitable, and the real difference between them is mostly comfort and convenience rather than a big jump in protection. The Quick Latch version simply makes it easier to drop the mask away from your face without removing the head straps, which some people find useful if they are in and out of the work area. I personally own and have used the Quick Latch version while working in commercial construction, and I can say it is a very good respirator that remains comfortable after long stretches.
Getting a good seal with a short beard can be tricky, but you can usually improve the fit by trimming the hair just under the seal line, tightening the straps firmly without overdoing it and doing a quick fit check by covering the cartridges with your hands and gently breathing in. If the mask pulls in slightly and you feel no leaks around the edges, the seal is doing its job.
For a small DIY project, you are unlikely to wear through a cartridge in a single session, but if the vapour smell becomes stronger while you are working, it is usually a sign that the cartridge is getting saturated and needs replacing.
The "use in workplace/professional setting" is just marketing language that says it meets the standard for and is appropriate in commercial settings. You don't need to consider this.
This Citeco Half Face Respirator A1P2 Kit, being an A1P2 respirator, would also be suitable. This Citeco Half Face Respirator Kit ABEK1P2, meets and exceeds the standard required, having additional protection for gases.
Let me know if you have any further questions.
Jacob
