I want to patch an acrylic boat cover with some leftover fabric the canvas shop gave me when they built it. The boat is at my dock from now until Oct. 1, exposed to sun, wind and rain the entire time. Looking for an adhesive that will stand up to those conditions. Pls don't refer me back to the canvas shop. They will tell me to buy a new cover, and that's not in the budget right now. Many thanks for your help.