Here's the company I was writing about:

http://www.industrialpolymers.com/products.html

Usual disclaimers apply...

: They have some products that would probably make a fine skin coating for any
: type of fabric. Might have to apply it with a squeegee instead of a brush,
: but I wouldn't think that would be so bad. Probably one thick coat, or
: multiple coats one right after another (just like Spiritline
: "Goop"). I've been thinking about using some type of molding
: urethane instead of the typical brush-on coating, but just haven't tried
: it yet. I once found an airport runway seam/crack sealer that looked like
: the perfect coating: super flexible and unbelievably abrasion resistant
: (hey, its meant to have commercial jets landing on it all day and night).
: Only problem was that the color was 'concrete' gray... I'll have to see if
: I can dig up the manufacturer, they had some other coatings that looked
: like good candidates for SOF.