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Old 05-05-2016, 04:57 PM   #1
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No drill solar panel mounts SikaFlex-221 or 3M THB tape?

i am planning to mount solar panels to the top of my 1977 argosy 28 motorhome using no drill mounts design for RVs and boats. These require industrial adhesive. i'm debating whether to use SikaFlex 215 or 3M THB double-sided tape. Both have excellent reputations for permanent adhesion. The SikaFlex and other similar industrial adhesive's are used to hold windows onto the side of skyscrapers. The THB double-sided tape is used by car manufacturers to hold anything from trim to body parts. Either is recommended for my application. Just wondered if any of you have a preference and/or experience and why? Thanks.
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Old 05-05-2016, 05:08 PM   #2
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Resident solar expert Lew is a big fan of the tape.
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Old 05-05-2016, 05:54 PM   #3
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Just completed the install of a solar system from AM Solar and the supplied feet have the 3m tape preinstalled and it was recommended, and I followed their recommendation, and purchase 1 tube of Sikaflex 221 to augment the tape and to seal the screw holes that are in the feet and around the edges. Nothing better than additional failsafe.
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Old 05-05-2016, 05:59 PM   #4
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No drill solar panel mounts SikaFlex-221 or 3M THB tape?

Just don't clean with alcohol if you use Sikaflex. Lew advises against it.

He uses VHB tape on the foot then seals over it with Sikaflex.

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Old 05-05-2016, 06:15 PM   #5
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I vote for properly applied vhb
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Old 05-05-2016, 07:06 PM   #6
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VHB tape AND SikaFlex. Carb cleaner or mineral spirits ONLY for surface prep. Also clean the tops of the rocker foot mounts.

The SikaFlex 221 serves 2 purposes after the VHB is stuck down:
1. It provides a secondary bond along with the VHB
2. It acts as a waterproof barrier to keep the VHB dry.

I've never lost a panel using this method!! 😃


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Old 05-05-2016, 08:26 PM   #7
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No drill solar panel mounts SikaFlex-221 or 3M THB tape?

Thanks for chiming in Lew, I couldn't remember the detail of what to clean with.

I'm adding panels to our AS and this time I'm using your method....😄 instead of rivets and Sikaflex like last time. (Too soon old, too late smart...)


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Old 05-05-2016, 09:06 PM   #8
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Look up click bond products. They're used in airplanes, cruise ships and the military.
Great product. I think Kip can vouch for them as well.
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Old 05-06-2016, 01:27 PM   #9
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Quote:
Originally Posted by lewster View Post
VHB tape AND SikaFlex. Carb cleaner or mineral spirits ONLY for surface prep. Also clean the tops of the rocker foot mounts.

The SikaFlex 221 serves 2 purposes after the VHB is stuck down:
1. It provides a secondary bond along with the VHB
2. It acts as a waterproof barrier to keep the VHB dry.

I've never lost a panel using this method!! 😃

Lew Farber
Okay THB and 215 with carb cleaner it shall be. Now if I can only get a dry day... thanks much!
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Old 05-06-2016, 01:44 PM   #10
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Both - you can't go wrong, tape first followed up with sikaflex.
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Old 05-06-2016, 06:24 PM   #11
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Quote:
Originally Posted by cdufault View Post
Okay THB and 215 with carb cleaner it shall be. Now if I can only get a dry day... thanks much!

That's VHB and 221........ to be sure!!!


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Old 05-07-2016, 01:02 AM   #12
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lewster is right. He did the same thing to my roof mounts. On our way home, 1,100 miles and 30 hours later with a Wally World stop, we hit 80 mph off and on because my friend needed to get back to work. A little fast for this old man, but it gave the new panel mounts a good acid test and they are still holding tight.
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Old 05-07-2016, 01:20 PM   #13
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Sikaflex. We have a 1977 28' Avion with solar and have transtioned to mostly led lighting. The solar keeps the batts charged.
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Old 06-20-2016, 09:22 PM   #14
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No drill solar panel mounts SikaFlex-221 or 3M THB tape?

Just arrived in Fairbanks Alaska. The new panels I installed, per AM Solar directions, have survived over 3 days of torrential rain in Alberta and British Columbia Canada. To include temps in the high 80,s to the lows in the mid-30's in the last three weeks and sustained 30 mph headwind while driving at 60mph. The panels have been checked and rechecked and are still securely attached and functioning as advertised.


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Old 06-21-2016, 08:22 AM   #15
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Can someone post a photo of a panel foot with the SikaFlex applied? I would like to have an idea of where (and how generously) to apply the SikaFlex.

Thanks, Hank
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Old 12-16-2018, 03:46 PM   #16
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Solar mount with Sikaflex

How long does it take for the adhesive to cure so it is safe to travel without losing solar panels?
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Old 12-16-2018, 05:18 PM   #17
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How long does it take for the adhesive to cure so it is safe to travel without losing solar panels?
24hrs
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Old 12-17-2018, 04:53 PM   #18
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It takes significantly longer to fully 'cure', but a day or two should be sufficient as a top coat over the 3M VHB tape that you should be using on your mount feet. The longer the better!!!
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Old 12-17-2018, 05:03 PM   #19
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As a Lew disciple, I used the AM Solar supplied VHB to all 6 of the solar panels on my trailer. This was back in 2015. They are all still there....after about 70,000 miles of trailering.
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Old 04-09-2019, 01:08 PM   #20
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Quote:
Originally Posted by lewster View Post
VHB tape AND SikaFlex. Carb cleaner or mineral spirits ONLY for surface prep. Also clean the tops of the rocker foot mounts.

The SikaFlex 221 serves 2 purposes after the VHB is stuck down:
1. It provides a secondary bond along with the VHB
2. It acts as a waterproof barrier to keep the VHB dry.

I've never lost a panel using this method!! 😃


Lew Farber
RVIA/RVDA Nationally Certified Master Tech
ABYC Certified Master Marine Electrician
Master Tech Energy Systems, Inc.
AM Solar Certified Installation Center*AMS Lithium Batteries
Lifeline AGM Batteries**Magnum Inverters***Victron Energy Components
541-490-6357

Are you saying to lay down the VHB... Then put sikaflex on top of the adhesive surface of the tape?? Or do you mean adhere the panel to the roof with the adhesive surface of the tape and then run a bead of sikaflex along the edge of the panel to the roof surface?? Thanks
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