For those of you that don't mind spending money on good tooling, here's a air/face shield that would be great for high dust and bottom work. This would go good with a full Tyvek suite. No need for the respirator mark around the face.
This thing looks like it would work pretty well till it got filthy and scratched in service. It would however prevent the user from drinking Shiner Bock no matter what its condition...that may be a plus. Hmmm maybe required equipment for travel to the gulf coast.