How much adhesive do I need for a solar panel bracket?

If you're using adhesive you want as much surface area connection between the bracket and the roof. A couple inches of bracket may not be enough. Using adhesive under Unistrut that matches the full length of the solar panels is much better. But I'm a lot more comfortable with actual fasteners.

Can you use adhesive on solar panels?

I strongly urge you to avoid using any adhesive for solar panels. Keep in mind that flexible solar panels don't last long. You will probably need to replace them every couple of years. That will be a challenge with them glued in place. For rigid panels, the best adhesive would be M6 bolts.

How do you attach solar panels to a cargo trailer roof?

I have used adhesives to attach solar panels to the roofs of two cargo trailers. One was 18 years ago, the other one 7. They are both still on there very tight. Clean the roof VERY well. Use alcohol on the roof and the feet to make sure it is absolutely clean. When it is dry, use E6800 adhesive. It's available at craft stores, or online.

How do you secure a bracket to a roof?

Butyl tape between the bracket and the mounting surface and then Dicor Self Leveling Lap Sealant around the edge of bracket and on top of the fastener is the way to ensure there is no water intrusion. How long are your brackets? If you're using adhesive you want as much surface area connection between the bracket and the roof.

Will UV & water damage plastic brackets?

Plastic is a difficult material for many adhesives to bond successfully, not helped with the release agents that may have been used in the manufacturing process of the bracket. Can you be confident that long term exposure to water and UV will not degrade the plastic.

Can you use E6800 adhesive on brackets?

When it is dry, use E6800 adhesive. It's available at craft stores, or online. (Do not use E6000, it is not sunlight resistant.) After it has dried several days put some paint over the plastic parts of the mounting brackets. That will reduce Sun cracking and yellowing, it will make the brackets last longer.