Really Boring Tarp Question

Ok so if anyone is bored...I HAVE A FEW RANDOM QUESTIONS. And Yes this is a Tarp Thread.

I dont live near a large hardware store so I am doing some research before I pull my boat out tomorrow night, and would like to get the tarp before I have the boat out.

I am taking my boat out of my barn and de winterizing tomorrow. I have a 06 23' B52 with the really nice cover that came stock. I live in CA and we have very long summers that are virtually rain free, but can get some showers most of May and even into late June. I store my boat in an old low cieling barn and have to basically remove my tower, I dont want to do this every day during the summer so will be buliding a metal shed for the boat....but until then

Question 1- I want to prevent UV damage on the cover and exposed side of boat, my driveway gets blasted by sun all day on the starboard side of the boat. What size of white tarp would cover front to swimdeck, and basically down to the trailer's tire (on both sides of boat). I have the regular tower that came on the 06B52s Skylon with a Zieman Trailer, BUT HAVE 4 Wetsound Pro 80s stickng straight UP above the tower. How high is this? Has anyone measured their trailed boat's height?
--I was thinking a 30' by 24' Tarp would do the trick.

Question 2- What is a way to repair a small rip in the original MB cover? Its on the edge, not in the main part of the cover. Sew? or....

Question 3- What is a good water proofing agent? Prefer a spary, for the original MB cover? Camp Dry?

Thanks