/diy/ - Do It Yourself

Is there a way to refresh these at home? It's time to get innovative.

I have a couple sets of these but due to current events they are difficult to obtain. I want to use them for oil based paint. They still block solvent odors so the carbon filters are still good, but because I also put on the respirator for sanding I think the particulate filter portion got too clogged over time and they take a good amount of effort to breathe through. Any ideas?