Dawn, here's a pic for reference:
https://www.facebook.com/SweetAirSoap/photos/pb.430439667021712.-2207520000.1428965470./769961839736...I used 2 plastic sheets for the top of the canopy. They're 9 ft wide x 20 ft long. Since the canopy is 10 ft x 10 ft, 1 sheet isn't big enough to cover the entire top so you have to use 2 & overlap them. This gives extra protection for the top of the canopy plus it gives you extra to hang over the front & rear of the canopy.
As you can see by the pic, I overlapped the plastic sheets on top so that about 2 ft hung over the front & back of the canopy, and about 5 feet hung over both sides.
I took the end corners of the sheet where they hung down on the sides, & wrapped them around a leg of the canopy. Then, I used a spring clamp on the inside of the tent to clamp the tied plastic corner to the canopy leg.
I also used white duct tape to tape the edges of the plastic to the white canopy sidewalls. If wind had a chance to get under the plastic, I'd lay down a strip of the white duct tape. If the plastic was near a leg or metal part of the frame, I'd clamp it with a small spring clamp.
It rained & poured all day & then the wind came up in the afternoon, but we were nice & dry thanks to those plastic sheets. I'm sure the Caravan canopy would repel rain, but again, they say it's "water resistant" not "waterproof". I know those plastic sheets are waterproof so they're going on my canopy anytime there's even a speculation about rain.