Bond- HUD to PVC

[upsman]

I am working on a sign that is 4' x 8' x 1" HDU was going to use .5" PCV on the back to give it some strength. What should I use to bond them together? I read the post Sign info on material and "sandwiching". http://www.talkshopbot.com/forum/showthread.php?t=10919 . I was going to use Liquid Nail; but after reading this post I am not sure this is the right product. I am looking for some advice on what I should use. Thanks for any help.

[joewino]

We use West System two part epoxy.

[joe]

This is a disaster that's waiting to happen, no matter what adhesive will be used.

http://www.talkshopbot.com/forum/showthread.php?t=11746

[upsman]

Ok, I am not using Dibond. Just PVC .5”. The Doctor I am making the sign for ask for no wood or plywood. I said we could use HDU with a sheet of PVC on the back. Am I Wrong?

Is there something other than PVC I should use?

Raymond the West System two part epoxy is that the 105

http://www.jamestowndistributors.com/userportal/show_product.do?pid=3760&familyName=WEST+System+10 5+Epoxy+Resin


Also have you ever tryed the Six 10 http://www.youtube.com/watch?v=YOB-OE3-4UQ

Thanks for any help

[erik_f]

I am not recommending anything...but you might want to try PC-7

[wberminio]

Tim
Are how are you mounting the sign?
If you are mounting it to a wall you should be OK

[wberminio]

Tim

The basic rule in woodworking-
( and seems to apply with these other materials)
in order to keep materials from warping is :

What ever you do to one side you do to the other.

One side finished/other side finished.
One side veneered other side veneered with same thickness veneer..........

PVC on one side on the PVC other......

A sandwich has 3 sections
Bread on outside ham in the middle

Simple and works -for the most part

[joe]

I'd suggest a glue up test! Lets say 2"X4' of the materials laminated up. Lay it out in the sun and see what happens. PVC is a little floppy when it heats up. I'd be willing to lay some money on this one. The reason many of us have been using aluminum in combination with HDU is the expansion co-efficients are similar. Even if you take use strips of silicone adhesive, which are supposed to allow for expansion, it's going to warp. But don't take my word for it, do the tests.



Epoxy: All brands I've used worked well. Some are a little thicker like PB Resin, which I prefer. But those at your hardware should work well. I purchased a tube last week which goes in the regular calking gun. It's thick and good for vertical use.

J.

[marysvillesign]

Upsman,
I have successfully used Dibond & MDO plywood as backer boards for HDU from 1" to 2" thick (6mm dibond & .75" MDO). I would never recommend PVC due as PVC has little to no structural capacity. (well, maybe if someone gifted me a 2" thick sheet).

[upsman]

OK from all the feedback using PVC has a backer board on HDU is not a good idea. I am going use MDO.

I have never used MDO before, going back to the question.

What should I use to bond the MDO to the back of the HDU?

Two part epoxy or Adhesive.

Erminio the answer your question the sign is going to be mounted on the wall.


Joe, I am going to do some testing on this when I get some time. Will post my findings, again thanks for all the feedback and help.