I have just been Glue-ing up my gas masks and found this the best way to do it.
Mix up Builders PVA in a disposable water bottle 4 parts water to one part PVA.
Hold the canister in a rag between your knees to catch any overspill. Cut the corner off a small plastic sandwich bag and insert the bag into the air inlet slot. Pour the PVA into the bag a small amount at a time, it fills up quite quickly so just go slowly. When it fills up move to the next slot and repeat.
I then let it settle and repeat. This ensures the filter is saturated in the mixture.
I will let the canisters dry for a week in a warm area before putting them back in the bag.
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