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The normal (open cell) foam used in chairs, cushions, etc is the spongy stuff that absorbs water and is quite soft, limp and squashable – not suited to our needs.
Closed cell foam is the stuff used in camping mats (between your sleeping bag and the tent floor) or in those inter-locking square mats sold in camping stores for tent or caravan entrances. It is generally more rigid, quite tough and does not absorb water as it has been chemically blown.
I had an old camping mat so I just cut a thin strip approximately 10mm wide and then used a contact adhesive to glue it to my stainless steel mask (from H0ughy) which had been spray painted with a matt black paint.
You spread a layer of glue on the edge of the foam strip and a layer of glue on the circumference of the mask. Wait approx 10-15 mins (read the instructions) and the glue dries to become slightly tacky and then you carefully mate the foam strip with the mask, curving it as you work your way around. The main downside with contact adhesive, apart from the fumes it gives off, is that once the two surfaces have been pressed into contact, that’s it – you cannot unpeel the foam strip and mask to re-seat the strip, so you need to get it right 1st time.
Cheers
Dennis
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