Good Sam Club Open Roads Forum: is weldwood contact adhesive strong enough?
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 > is weldwood contact adhesive strong enough?

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JoeChiOhki

Sauvie Island, OR

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Posted: 07/04/20 03:03am Link  |  Quote  |  Print  |  Notify Moderator

Question for those more experienced with Weldwood contact adhesive.

I'm in the process of redoing the interior of the one piece fiberglass shell that makes up the snap-n-nap on my amerigo tc-11 and need to install some wood to the interior edges so that I can anchor the RV wall board over the new insulation.

Normally I would just apply 3m 5200 and screw it in place, but because there's no frame, and the angle at which its going in, this isn't practical.

My thoughts instead were to apply weldwood contact adhesive to the fiberglass and wood so I can just press the piece in place, but I am wondering if this will be strong enough or will it lose the battle with gravity after awhile?


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ticki2

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Posted: 07/04/20 04:57am Link  |  Quote  |  Print  |  Notify Moderator

Weldwood is pretty good stuff but I would be hesitant to use it in the vertical were it could be exposed to big temperature change and heat from the sun . How about fiber glassing the filler boards to the shell . That's what they do on boats and truck caps for stiffeners , and they won't rot .


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chast

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Posted: 07/04/20 05:31am Link  |  Quote  |  Print  |  Notify Moderator

Weldwood is pretty good stuff and, from experience, I would say you have a 50/50 chance of success in using it. I built a Florida room for a friend who lives full time in Florida and had the same problem. I used Weldwood in putting up some of the moldings and, 10 years later, most of them stayed in place. I believe the ones that needed to be re-done were due to applicator error.


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bighatnohorse

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Posted: 07/04/20 07:09am Link  |  Quote  |  Print  |  Notify Moderator

Changes in formulation may have occurred over time.
Former high VOC materials have been modified to water based products, which often are not as good.

Materials used ten years ago may not be the same materials available to you now.

wapiticountry

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Posted: 07/04/20 05:05pm Link  |  Quote  |  Print  |  Notify Moderator

ticki2 wrote:

Weldwood is pretty good stuff but I would be hesitant to use it in the vertical were it could be exposed to big temperature change and heat from the sun . How about fiber glassing the filler boards to the shell . That's what they do on boats and truck caps for stiffeners , and they won't rot .
Fiberglass cloth and resin is what I would use as well.

Camper_Jeff_&_Kelli

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Posted: 07/04/20 05:21pm Link  |  Quote  |  Print  |  Notify Moderator

wapiticountry wrote:

ticki2 wrote:

Weldwood is pretty good stuff but I would be hesitant to use it in the vertical were it could be exposed to big temperature change and heat from the sun . How about fiber glassing the filler boards to the shell . That's what they do on boats and truck caps for stiffeners , and they won't rot .
Fiberglass cloth and resin is what I would use as well.


I was thinking this too. Setup a support brace to hold the work in place.


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JoeChiOhki

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Posted: 07/04/20 05:44pm Link  |  Quote  |  Print  |  Notify Moderator

wapiticountry wrote:

ticki2 wrote:

Weldwood is pretty good stuff but I would be hesitant to use it in the vertical were it could be exposed to big temperature change and heat from the sun . How about fiber glassing the filler boards to the shell . That's what they do on boats and truck caps for stiffeners , and they won't rot .
Fiberglass cloth and resin is what I would use as well.


Yeah, this was my concern, glassing them into place isn't really doable due to it being an overhead job, as gravity tends to cause it to run off, so we'll likely need to brace them in with 5200.

ticki2

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Posted: 07/04/20 08:08pm Link  |  Quote  |  Print  |  Notify Moderator

Being on an Island you must have some decent size boat shops . Talk to their glass man , there are a lot of tricks to the trade .

* This post was edited 07/04/20 08:17pm by ticki2 *

Grit dog

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Posted: 07/05/20 11:01am Link  |  Quote  |  Print  |  Notify Moderator

Why not test a couple different adhesives?
Contact cement, construction adhesive, epoxies, gorilla glue.
If you can clamp it, gorilla glue may win.


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Posted: 07/05/20 11:40am Link  |  Quote  |  Print  |  Notify Moderator

Hi Joe,

Titebond Construction adhesive is really good stuff. Sold at Parr lumber, I know. HD does not have this good of adhesive. I reinforced my sagging cabover using the Titebond product. Has held on rough roads for two years now.

7 years after glueing 2x4's to concrete a basement wall, you couldn't get them loose as they were splitting apart to get them off. It good stuff, but you need to place the pieces together right away and apply pressure. The stuff really works.

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