From I've learned over the 10 years I've owned my Roo, it's vinylized canvas.
Not sure why you want to waterproof it, they don't need it.
unless you are talking about the tent windows which aren't vinylized.
Should be a manufacter tag along one of the tent seams. Contact them.
Roo/Shamrock tent ends are made by TJ Snuggles in Indiana.
Why do you think they need waterproofing?
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC