No, I didn't do any waterproofing treatments on the canvas. More importantly, I didn't design the awning
to prevent water from coming in. I actually considered it. We would have had to have the snaps on the other side of the door to rain proof it, which would have made them MUCH more visible when not in use.
Our thought was that the awnings were for changing clothes and maybe we'd leave them up for extra ventilation on hot summer trips. If it's raining, we'll be shutting up those doors nice and tight.