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Old 10-27-2018, 04:21 PM   #1
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Adhesive used between fiberglass and metal

I have a 2013 36' sightseer. We have two locations where the adhesive between the fiberglass and a metal bracket have failed.
I am trying to figure out if anyone knows what kind of adhesive this is and if there is a better adhesive to use.
The adhesive has failed to stick to the metal brackets.
Coach has 38,xxx miles now and it seems this should not be a failure point on something this new.
Both failures have happened in the RF corner of vehicle. No damage or accident has occurred anywhere on RV.
We have been to Alaska with this one and the roads are rough but not really that bad compared to the rest of the trip.

Any thoughts?

Thanks in advance for any and all help.
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Old 10-27-2018, 04:36 PM   #2
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Try a heavy duty truck body shop. We had some awesome 2 part epoxy adhesive that we used to bond the composite body panels to the aluminum framework of the Peterbilt cabs.
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Old 10-27-2018, 09:24 PM   #3
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I used Gorilla Glue on mine just to see and it works. Fog lamps and front generator door still holding. It expands and sticks. 2 years ago.
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Old 10-28-2018, 06:05 AM   #4
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There are many things to consider, such as how much weight is being put on the joint, how smooth metal is, or if the metal has any coatings on it, and what is the subsurface of the fiberglass? It would be a bit more helpful if you could say what the bracket is or include a photo.
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Old 10-28-2018, 06:42 AM   #5
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I used SEM 39537 Weld-Bond Adhesive. It's sold by body shop supply houses for securing plastic and/or fiberglass panels to a steel substrate. It's not the cheapest, but is definitely high quality.

https://www.amazon.com/SEM-39537-Wel.../dp/B000HB0LLU

I used it in 2004 on our 2001 Adventurer to secure a headlight bucket to the grille panel. It was still holding fine in 2013 when we traded off the motorhome. At the time of the trade in the motorhome had in excess of 110,000 miles on the odometer
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Old 10-28-2018, 09:48 AM   #6
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I can't find the info now but Winnebago customer service will tell you what they use. If the surfaces are cleaned properly the adhesive they used works great.
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Old 10-28-2018, 11:02 AM   #7
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I used liquid nails. It took several days to fully dry. I fround the old adhesive off of the metal brackets and the body panel. Wiped down the surfaces with acetone.

https://www.lowes.com/pd/LIQUID-NAIL...hoCu2QQAvD_BwE
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Old 10-28-2018, 06:07 PM   #8
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I used JB Weld 2 part epoxy. Get all residue off the metal part with denatured alcohol, rough up surface a little with a wire brush. JB Weld working well for me. Critical to clamp the parts together movement free for a good 6-8 hours, longer than that if possible.
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Old 11-04-2018, 06:17 PM   #9
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Quote:
Originally Posted by Rvbuzz View Post
I have a 2013 36' sightseer. We have two locations where the adhesive between the fiberglass and a metal bracket have failed.
I am trying to figure out if anyone knows what kind of adhesive this is and if there is a better adhesive to use.
The adhesive has failed to stick to the metal brackets.
Coach has 38,xxx miles now and it seems this should not be a failure point on something this new.
Both failures have happened in the RF corner of vehicle. No damage or accident has occurred anywhere on RV.
We have been to Alaska with this one and the roads are rough but not really that bad compared to the rest of the trip.

Any thoughts?

Thanks in advance for any and all help.
:have you checked into the Auto Industry to see what they do for glues they are FG and Metal? Then we have boats out there in similar conditions. By the way if your waxing and cleaning your MH I used Maquires50 for the first time and oh boy does it work nice, cleans and waxes all at once and you do not need to buy 1 gallon you only need about a Quart for 30 footer and even then we had half of it left. Now my friend is trying it on his car but first on his boat.
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Old 11-04-2018, 07:15 PM   #10
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3M makes some great products. I would look into either 3M 8115 or 3M 8219. Contact their Product Support and describe what you are trying to do. They should be able to tell you which of their adhesives would work best for the situation. Alternatively, a boat repair shop should have helpful advice. In any case, proper surface preparation will be the key to good results.
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Old 11-04-2018, 08:52 PM   #11
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x2 jb weld
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Old 11-04-2018, 09:06 PM   #12
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x2 on 3m 8219.
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