
Simple and fast to make fitting mask - ibudiallo
https://ragmask.com/
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fortran77
I've been making similar masks-2 layers of fabric with a layer from a vacuum
cleaner bag in between.  But I have had success gluing the seams with white
glue (the non-toxic elmers stuff) instead of sewing.  A good option for those
of you without a sewing machine. 

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fyfy18
PVA glue is water soluble, so if you wash it you'll need to rebuild it.  For
something like this you don't need a sewing machine, just need a needle and
thread is enough. 

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Doxin
PVA glue is _not_ water soluble after it has cured.  It's a common myth which
is entirely false and easily testable.