Exterior rated/grade adhesive to add final touches for my shade fabric applied to EMT rods?
Consider using a double-sided clear mounting tape. 3M makes one with a clear but rubbery and flexible carrier that makes an extremely strong bond. Since it sticks immediately, you don't have to spend time holding it. Remember that tapes of this type have a bond strength that improves greatly over the first 24 hours, so if you do a small area as a test, give it a day before you test it for strength. Brands other than 3M are available, but I know the 3M is suitable for outdoor use and resistant to water and UV, and I've seen it in a big-box home improvement store as a small roll on a blister card. It looks red because of red release paper, but the tape itself is clear.