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One basement wall is in pretty good shape, just going to wet and lightly scrape before painting with new Drylok. Other walls are pretty bad, flaking and such.

I have 3M 8210 n95 masks, is that sufficient for scraping old Drylock ? Going to find a way to ventilate the basement too.

Thanks.

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    Not sure what is around these walls but I have always used really really hot water - boiling if I can (turn up that water heater) and a tiny bit of bleach per bucket. Get paint wet and hot and it scrapes off much easier. I see no reason for even a mask using this method... If you are going to dry sand it with a metallic brush then yes mask - I would never do that though for a basement wall.
    – DMoore
    Commented Jul 2, 2020 at 17:08
  • @DMoore a steamer should do the trick, too. Might not want to breath steamed bleach, though...
    – FreeMan
    Commented Jul 2, 2020 at 18:19
  • @DMoore - whats the reason for not using a metalic brush? the good section - sure, but the bad sections its all flaking off.
    – House DiY
    Commented Jul 2, 2020 at 18:28

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Your primary concern would be with any lead-containing coating beneath the Drylok. Your secondary consideration should be for silica.

According to the CDC, an N95 is NOT adequate for lead dust, you need a P-100 or equivalent rating on your respirator.

For airborne silica dust, an N95 is acceptable.

So if you are relatively confidant that there isn't an old lead-containing coating beneath the Drylok, the N95 would be sufficient.

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