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I've been well served by just using a P100 respirator when I'm doing anything dirty or dusty. There have been a few times that it's reduced exposure to somethin

by pvab3 23d ago

I've been well served by just using a P100 respirator when I'm doing anything dirty or dusty. There have been a few times that it's reduced exposure to something bad that I didn't know about, among them removing old shingles from my attic (asbestos composite material) or sanding paint that I had tested negative for lead (transparent varnish underneath had lead).

amluto 23d ago
> transparent varnish underneath had lead Weird. Wasn’t lead typically used as an opacifying agent? In any case, if you test by taking a little scraping, you can only detect lead that you actually scraped. But if you test with X-ray fluorescence, you get an integrated density over a decent thickness. Also, even if the P100 respirator protects you adequately while sanding, it provides no protection against future exposure to the dust that you create.
- gucci-on-fleek 23d ago
  > Weird. Wasn’t lead typically used as an opacifying agent? That's its role in paint, but lead glass [0] is a thing, so transparent lead-based compounds do exist. [0]: https://en.wikipedia.org/wiki/Lead_glass https://en.wikipedia.org/wiki/Lead_glass
- pvab3 22d ago
  there was a layer in between. I had it XRF'd after I started. And I always cleanup with a full HEPA vacuum anyways.