Have Asthma so I use a mask when working anyway but only one I had in the house was a medical mask. Guess a trip to Bunnings is in order to get something more suitable.
I don't know if they have upped the price due to mandatory mask wearing, but they *had* dropped their price on N95 masks from $25 for 5 to $5 for 5. For sanding, you don't realy need to go to a cartridge respirator