Several years ago I had a large breathable groundsheet given by a friend who had sold his caravan, due to it's very large size I cut a length off to suit my caravan awning. Now I have changed the caravan to a larger model and when the groundsheet is used in the awning, (in two pieces), there is a overlap which is a trip hazard. Are there any suggestions out there for joining the two lengths together in a permanent manner? I know there will be a little overlap but that is not a problem, is there a strong waterproof tape which I could use? The groundsheet is light grey in colour. Thanks.