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Old 05-12-2015, 03:30 PM   #15
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panels

I have the marine 3m fast cure sealant. I don't trust VHB and have had failures with it - plus my roof isn't entirely smooth - it has slight grit to it.

All I can say is...if you absolutely, positively want to make sure it stays put, use the Marine 3m fast cure stuff. No need to drill...it's sticky, tacky, and goes nowhere once done.
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Old 05-12-2015, 03:36 PM   #16
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I suggest being very careful using a sealant when an adhesive is the proper tool for the job. 3M 5200 is a high strength adhesive - some argue "permanent". I suspect some sealants have some good adhesive properties but I'd be careful.
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Old 05-12-2015, 08:43 PM   #17
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Solar panels should not be glued to the roof as they require airflow. Gluing them down will cause them to run hotter than intended which leads to lower efficiency and possible early failure. If one fails can you remove the Glue without wrecking the roof? You will need to drill holes anyway to hold down the power cables and possibly more holes to install a junction box. Using screws, a panel can easily be removed for roof maintenance or other repairs. I use stainless screws if I can hit a truss in the middle otherwise I use rubber well nuts. Use plenty of lap sealant and you're set!

PS 3m 5200 requires a primer for properly bonding many metals.
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Old 05-12-2015, 08:56 PM   #18
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3m's 4200 is as strong as the 5200, but allows you to take things secured with it back off. Boaters know both versions well.
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