Too damn hot for sand blasting!

For EVERYONE.
If you are using "sand" be aware of the dangers.
If you (try) to read 3M's recommendations that come with their P100 HEPA filters, they use language that neither I nor a mechanical engineer can decipher.
Lawyers.......
Now that being said, I finally found some clear guidelines.
This information is very hard to dig out in clear form.
Look on page 12.
Bear in mind these are government guidelines.
IF you are going to "sand" with a half mask, most knowledgeable people might discourage it.
It all has to do with levels.
http://www.cdc.gov/niosh/docs/96-112/