Wrenches, There are PV-specific adhesives certified for use on backsheets.
Examples are: Dow-Corning 737 Dow-Corning 804 Tonsan 1527 and others. These are silicone-based, but NOT at all like what you'd buy from big-box or similar outlets. Consumer-type silicone adhesives such as Ray mentioned will *not* have the long term adhesion to the backsheets. They work for a while, but not 20 years. Any good distributor of adhesives will stock or can get what you need. Here in the Dallas/Fort Worth area we have a company called "Krayden". They have warehouse locations around the country, and stock the Dow adhesives I mentioned above. I'm sure there are also other sources. For small jobs, you can buy these PV adhesives in "caulk" sized tubes that work (where else?) in a caulking gun. Dan
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