Join Date: Apr 2006
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Re: Solar Panel installation with 3M 4200
An interesting dilemma, since the ideal adhesive would have to be both permanent AND removable for maintenance. You might be able to do something like this:
Get a thin (2mm?) sheet of white EDPM (or butyl or neoprene) from Grainger or other suppliers. Spray, carefully, with 3M's permanent spray adhesive. Check with 3M as to which one will be permanent, they're not all the same and not all heat-resistant.
Allow to dry, spray rear of panel with same adhesive. Bond together. Now neatly trim the edges flush, or on an angle (freehand or with a matte cutter) and then spray the new back side with the same adhesive, after making a pattern from the panel.
Solvent clean the deck, use the pattern to mask off an area, spray it with the same adhesive, and carefully lay the panel down. Sandbag to press while it dries.
That should give you a reasonably permanent, completely closed and sealed (no voids to grow mildew), slightly insulated bond between the panel and the deck. More work than 4200 but a way neater edge, and no needed to use a notched trowel or play other games making an even layer of bonding material.
In the worst case if it bonds too well and you need to get in there? The EDPM or other "rubber" will come apart, when you find a big enough gorilla to pull on the panel.
The hardest part will be finding a windless day to do the spraying.(G)
Unless 3M makes their VHB tape in sheet form, already set to go?