There was a longish thread a while back about masks that will filter out methanol. The general conclusion was that only a mask with air pumped through it, from an external source, would be any good.
A certain American flipped out, claiming he had a mask that would filter it out.
If you go to his website, he has a picture of the mask as his avatar...........
No idea if it is any good or not, I suspect not...........
Link to said website. His avatar isn't coming up for me, but I think he mentions tha mask somewhere.
http://beyondbiodiesel.org/forum/index.php