We had a huge storm and heavy rain Friday evening. I took the caps off Saturday morning and rolled it out. The awing was wet from the edge in about 3' on both ends. The bottles didn't keep it dry, but I was clear the moisture was coming from rain and not condensation. I assume the water is getting into the awing by running on top of the canvas under the cut edge of the bottle.
I will say the awing was less wet than with no caps. In the past when I roll it out, the water seemed to drip heavily as it unrolled for the full length of the awning. Using the caps it was only wet a few feet in from the edges. I might try to figure out a way to make the cap fit more tightly to the rolled up canvas. Right now, it seems to have about a 1/8" gap around it.
2013 White Hawk 28DSBH
1996 Ram 1500 5.9L
Reese Straight Line WDH
Tekonsha Voyager BC