Hi Denny,
I agree, 3m's support has been excellent. We were at the annual trade show for our hardware store supplier in Orlando in late Feb. I had some of the same questions that have been asked here, but, at the time, only with respect to mounting a
solar panel , as you have. There was a member of the technical department at the 3m booth. He answered nearly all my questions and while I waited, he called another tech person at 3m when he did not have an answer to one of the questions.
My question was about surface preparation of
fiberglass before applying VHB tape. The "VHB Tape" specialist on the phone call from the office recommended using Acetone to clean the
fiberglass gelcoat , and then a
light scuffing using a Scotch Brite type pad or very
light touch with very fine sandpaper before applying the VHB tape.
The tech rep. at the show also mentioned the fact that you should wait at least 24 hours, and preferably more, before putting full
weight on the item. And, that the "Extreme Mounting Tape" #414 that is
sold at many hardware stores, is consumer packaging of VHB tape. That product is advertised to hold 20# for a 40" strip, or 1/2# per square inch. There is another 3m product that says it will hold 10#per 40" strip, but that is not true VHB tape. #414 is 1"x60", and sells for around $7-10, but appears about .025 thick--and most folks have been using the .045 thick VHB tape for most purposes on our FGRV's. So, if you can use the thinner version of VHB, it's available on the shelf at many Hardware Stores.
And, most all sizes and thicknesses are available through Grainger, but almost always require a 2 day wait. That was the case when I ordered some VHB tape to install bendable
solar panels on our
Eggcamper. Grainger ordered it from a regional warehouse and I picked it up at the local branch store in 2 days. Still haven't installed the panels yet, but hope to soon. Maybe I'll install an
awning with VHB also.
Mark