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msausen
Joined: 25 Oct 2007
Posts: 559
Location: Appleton, WI USA
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 Posted: Fri Oct 02, 2009 7:43 am Post subject: Window Glue |
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I thought I would share my experience with an alternative glue for adhering the windows. Based on a recommendation from Geoff Combs, I picked up some Lord 7545A/E urethane adhesive rather than using the Weldon 10 we are all familiar with.
I did follow the standard process with the rear windows and after that experience, along with forgetting my shims in the rush, I thought I would look into the alternatives. After not really finding anything definitive from the existing alternatives like Sikaflex I basically resigned myself to use Weldon for the doors. As I got within a couple weeks of doing the door windows Geoff had mentioned to me that he used something else for the window adhesive that was very much suited for the task and didn't have the quick cure times and viscosity issues of Weldon. I had forgot about it until he had a brief blurb in one of his post a couple weeks back. So I got more details from him and found a distributor that I could get the 50ML two part cartridge. The stuff is comparable in price to the Weldon at about $13 a kit and each 50ML kit will do a window easily. There is an additional cost in that you need a gun which is about $30 but it will work with any two part, 1:1, gun packaged product. Each pak also comes with a self mixing dispensing nozzle so you just stick it in the gun, put the nozzle on, and squeeze. Extra tips are less than a buck and if you don't use the whole cartridge you just chuck the tip and put the cap back on.
I'm sure many of you are saying that you've heard this before but this stuff is GREAT! It looks and acts similar to the Weldon but you get upwards of 30min working time and it doesn't even sag! This stuff is made specifically as a structural adhesive for plastics so it seems to be an excellent product for this application.
Not wanting to completely trust what I read I decided to a little non-scientific destructive testing. I didn't have a piece of scrap fiberglass anymore but I did have plenty of scrap plexi from trimming the windows so I took two pieces and glued an overlap of about 1.5x1.5 inch on two pieces of scrap. Cure time for this stuff is about 24 hours but I let it sit for about a week. This stuff doesn't get as rock hard as Weldon but it isn't flexible either. I took the glued piece and put it in the vise on its edge and tried to separate it in full edge shear (not really sure how to describe it but was the most difficult way to break it) and the plexi broke clear of the glue joint. I then turned it flat and tried to peel it apart and again the plexi broke away from the glue joint. So far the glue joint hasn't budged. I then took a hammer and beat the crap out of the remaining square which was basically just the glued area. After several whacks with the framing hammer I was finally able to get it to break into 3 pieces without ANY separation of the glue joint. I've attached a few pictures below so you can see what I'm talking about.
The initial swag I took at how many cartridges I would need was a little high so I have four extras that I can sell to anyone that is interested. I was thinking $16 each would cover the cost and shipping and I can send you my gun to use as long as you send it back in a reasonable amount of time.
Here is a link to the distributor I got it from. This page also has a link to the gun you need and extra tips if you want them. Keep in mind each pack comes with one tip too.
http://chemical-concepts.com/products.php?sid=192&limit=
Here is a technical datasheet on 7545A:
http://www.glue4you.com/PDF/Lord7545_TN001.pdf
If you want two or four of the unopened packs I have just drop me a email directly.
Michael
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indigoonlatigo(at)msn.com
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| Posted: Fri Oct 02, 2009 5:18 pm Post subject: Window Glue |
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You might want to find that piece of fiberglass and do the same test with the plexi to fiberglass and then also make sure you test it where the gab between the to is almost 1/8 of an inch. Make sure it still is as strong.
No doubt it is great stuff C but just be sure.
[quote] From: rvbuilder(at)sausen.net
To: rv10-list(at)matronics.com
Date: Fri C 2 Oct 2009 10:30:16 -0500
Subject: Window Glue
I thought I would share my experience with an alternative glue for adhering the windows. Based on a recommendation from Geoff Combs C I picked up some Lord 7545A/E urethane adhesive rather than using the Weldon 10 we are all familiar with.
I did follow the standard process with the rear windows and after that experience C along with forgetting my shims in the rush C I thought I would look into the alternatives. After not really finding anything definitive from the existing alternatives like Sikaflex I basically resigned myself to use Weldon for the doors. As I got within a couple weeks of doing the door windows Geoff had mentioned to me that he used something else for the window adhesive that was very much suited for the task and didn't have the quick cure times and viscosity issues of Weldon. I had forgot about it until he had a brief blurb in one of his post a couple weeks back. So I got more details from him and found a distributor that I could get the 50ML two part cartridge. The stuff is comparable in price to the Weldon at about $13 a kit and each 50ML kit will do a window easily. There is an additional cost in that you need a gun which is about $30 but it will work with any two part C 1:1 C gun packaged product. Each pak also comes with a self mixing dispensing nozzle so you just stick it in the gun C put the nozzle on C and squeeze. Extra tips are less than a buck and if you don't use the whole cartridge you just chuck the tip and put the cap back on.
I'm sure many of you are saying that you've heard this before but this stuff is GREAT! It looks and acts similar to the Weldon but you get upwards of 30min working time and it doesn't even sag! This stuff is made specifically as a structural adhesive for plastics so it seems to be an excellent product for this application.
Not wanting to completely trust what I read I decided to a little non-scientific destructive testing. I didn't have a piece of scrap fiberglass anymore but I did have plenty of scrap plexi from trimming the windows so I took two pieces and glued an overlap of about 1.5x1.5 inch on two pieces of scrap. Cure time for this stuff is about 24 hours but I let it sit for about a week. This stuff doesn't get as rock hard as Weldon but it isn't flexible either. I took the glued piece and put it in the vise on its edge and tried to separate it in full edge shear (not really sure how to describe it but was the most difficult way to break it) and the plexi broke clear of the glue joint. I then turned it flat and tried to peel it apart and again the plexi broke away from the glue joint. So far the glue joint hasn't budged. I then took a hammer and beat the crap out of the remaining square which was basically just the glued area. After several whacks with the framing hammer I was finally able to get it to break into 3 pieces without ANY separation of the glue joint. I've attached a few pictures below so you can see what I'm talking about.
The initial swag I took at how many cartridges I would need was a little high so I have four extras that I can sell to anyone that is interested. I was thinking $16 each would cover the cost and shipping and I can send you my gun to use as long as you send it back in a reasonable amount of time
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