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Question from Ruthe

 

I’ve been hearing some people are using waterproofing sprays on their homemade masks to prevent contraction and/or spread of COVID. This seems like a really bad idea to me – actually using it to breathe through.  Is there any way to safely make a bandana waterproof for breathing through?

Lisa’s Answer

 

It sounds like a bad idea to me too.  Waterproof sprays usually contain polyfluorinated chemicals (PFCs) which are highly toxic, particularly to put over your mouth and nose.  You could apply beeswax to a bandana to make it water resistant but I cannot tell you if that would do anything to better protect you from the virus.

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