Well thought out do it yourself face masks may offer more protection compared to the dust masks you get at the hardware store.
MIT research shows that water droplets from a sneeze or cough may stay airborne for longer than previously thought and travel up to 25 feet without any wind.
The dose makes the poison and, like starting a fire, if you don't have enough kindling (virus), then you probably won't get the fire (disease) going. However, better safe than sorry.
Here is some grabbing information from MIT, along with a mask design that appears to be both easy and effective. Do look at my other blog titled, "Coronavirus: Are Your DIY Face Masks Working?" Also, here is the channel whence this face mask concept comes from along with their other videos.
I did not do enough testing to prove that the more hydrophobic (water repelling) mask will provide more protection, but it certainly makes sense.
If you don't have access to testing, your next best action is to take any of these surveys:
Free 10 minute COVID-19 consults are now available. Write to me at firstname.lastname@example.org and provide your phone number. I cannot go beyond 10 minutes however.
Thomas J. Lewis, Ph.D.