What I did was removed the topper and set it on top of the roof, closed the slide had wife inside with a small cordless dewalt leaf blower while I was outside with soapy water in a spray bottle and sprayed the area where the slide seals against coach while she was inside directing the blower where it seals on the inside. Pay particular attention to the corners. if you have a leak it will bubble up. It is an awesome test wish I done it sooner. good luck...
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