So, would any of the available spray on fabric "waterproofing" solutions revive an otherwise virtually completely shot rain suit? Anyone tried them, and if so what was the result?

I've got a new rain suit, so all's well.

But earlier this year my previously trusty Performance rain suit completely failed on a cool rainy morning commute. It was at least 10 years old, and I surmise it had been washed one too many times, and maybe even washed improperly.

Not sure what to do with it. Although no longer waterproof, it still acts as a great moisture barrier for my sweat. Hoping an $8 bottle of spray will give me a spare rain suit--probably dreaming?