Then place a definitely waterproof tarps over it. Secured with clothline on the bottom thru all the lugs. Maybe you find one in silver... When I used this clear one, the effect was that I created a glasshouse/greenhouse and it got very hot inside and it discoloured the hailcover. Thus, my next improvement now is that I place a silver tarps over the clear tarps. I.e., even if the silver tarps is not perfectly waterproof, the clear one is.