3M Speedglas 9100 MP Air: Face Seal Installation

Here is how to replace the face seal on your Speedglas 9100 MP Air Welding Helmet. You should look to replace the face seal once every two months or earlier in really dirty environments, or whenever the seal becomes unhygienic. View the Speedglas 9100 MP Air here: https://www.apexweldingsafety.com.au/...