Foam Backing to a latex mask when it's in the mold

So I've watched this set of classes numerous times over the years, and there is a bit of info that is passed over as Tim is pulling the latex mask out of the mold. He mentions that since his mask was a little thin from the dwell, he backed it with polyfoam. But its never elaborated on and that foam isn't listed in the class materials. Is this just an A-B foam that he thinly brushed into the mold close to when the latex had dried? When he pulls it out of the mold, that large head definitely keeps it's shape. And I have an oversized mask as well that could use that support. Any idea on what he used and how he applied it? I don't want to fill the whole mask. Just enough to keep the form more rigid to maintain shape. 
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