Hi All, my Jayco Expanda '09, 16.49-2 has a leak where the PVC pop top skirt base outside, joins the caravan wall.It's worse when the roof-top aircon drainage runs off towards the rear of the van. Can somebody tell me how the bottom of the skirt attaches to the van? I can see some ?putty in sections. What can I use to seal it up? Ps I have tilted the van to encourage the air con to run off elsewhere, but rain a prob.