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I noticed something interesting the other night when I accidentally knocked off a piece of blue foamboad that I had glued to my layout. I had used liquid nails as glue, but where the glue once was was now a cavity. It seems the liquid nails had "eaten" some of the foam. This was much more apparent on the cut edge of the foam rather than the original flat side.
I have used two types of liquid nails - liquid nails for projects (with a red lable, I think), and one that says liquid nails for projects & "foamboad adhesive". Both seem to have the same problem. After re-reading the label on the back, it says not recoomended for gluing "foamboard to foamboard". I bought a different brand of foamboard adhesive last night, and have yet to test it out.
Has anyone else had this problem? What have you used to glue foam to foam?
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THe guys at the modular club used to use regular yellow glue, but found that once it dried around the perimeter, the interior stayed wet as no air reached it to cure it.
They now use "Gorilla Glue" - polyurethane glue that cures in contat with moisture. You need to lightly mist the glue before clamping the foam together. Where alignment is critical, you need to clamp it or otherwise watch, as the polyurethane foams slightly and can move things out of position.
I have used latex caulking with great success. I use a very thin layer, and keep the foam piece in place by poking bamboo skewers through them until dry (couple of hours generally, safest overnight).
Andrew
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MasonJar Wrote:THe guys at the modular club used to use regular yellow glue, but found that once it dried around the perimeter, the interior stayed wet as no air reached it to cure it.
They now use "Gorilla Glue" - polyurethane glue that cures in contat with moisture. You need to lightly mist the glue before clamping the foam together. Where alignment is critical, you need to clamp it or otherwise watch, as the polyurethane foams slightly and can move things out of position.
I have used latex caulking with great success. I use a very thin layer, and keep the foam piece in place by poking bamboo skewers through them until dry (couple of hours generally, safest overnight).
Andrew
Gorilla glue. Hmm. I would have guessed that would eat the foam for sure.
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nachoman Wrote:Gorilla glue. Hmm. I would have guessed that would eat the foam for sure. Don't ya know, gorillas don't eat foam, they eat bananas. 
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nachoman Wrote:Gorilla glue. Hmm. I would have guessed that would eat the foam for sure.
Nope... it's good stuff! I guess that the base (urethane) is compatible with the extruded styrene that is the foamboard.
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I use Liquid Nails for Projects and have not noted the problem you experienced. The only drawback I've seen is that glue lines are a real...problem to hide, so I keep the glue as far away as possible from areas that will be sculpted later. I use pink and white insul foam. What sort of foam are you using..?
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Steamtrains Wrote:I use Liquid Nails for Projects and have not noted the problem you experienced. The only drawback I've seen is that glue lines are a real...problem to hide, so I keep the glue as far away as possible from areas that will be sculpted later. I use pink and white insul foam. What sort of foam are you using..?
I have only been using blue foam - and only noticed the issue after knocking a small piece loose.
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Steamtrains Wrote:I use Liquid Nails for Projects and have not noted the problem you experienced. The only drawback I've seen is that glue lines are a real...problem to hide, so I keep the glue as far away as possible from areas that will be sculpted later. I use pink and white insul foam. What sort of foam are you using..?
The polyurethane (Gorilla) glue cures to a consistency similar to the foamboard itself,and can be cut, sanded, sculpted more or less the same way.
Andrew
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For the price of one Gorilla glue, I can buy 3 tubes of LN...!!! 
The joints on my FB are so strong, trying to separate them will tear the foam before the glue gives way....
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I think the last type of glue I used on foam was Gorilla Glue. It comes in a tube, is easy to apply & worked very well on my most recent layout. Rob.
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I've used green contact cement (a latex version,I think) by Lepages. I haven't done any destructive testing yet. Main problem is no lattitude in assembly, no second chances.
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I used both forms of liquid nails on my layout without a problem, but I also glued foam to plywood not foam to foam. I can't see what difference that could make. I also used the blue foam not the pink kind, I don't know if that makes a difference ether. The only time that I noticed anything like that was when I used hot glue, even the low temp stuff melted the top 1/16 inch or so of foam.
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e-paw Wrote:I used both forms of liquid nails on my layout without a problem, but I also glued foam to plywood not foam to foam. I can't see what difference that could make. I also used the blue foam not the pink kind, I don't know if that makes a difference ether. The only time that I noticed anything like that was when I used hot glue, even the low temp stuff melted the top 1/16 inch or so of foam.
The difference in gluing foam to wood versus foam to foam may be that the wood is porous and therefore allow "breathability" for whatever component attacks the foam. If it cannot escape at all (foam to foam) it just goes to work trying to eat its way out...!
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MasonJar Wrote:The difference in gluing foam to wood versus foam to foam may be that the wood is porous and therefore allow "breathability" for whatever component attacks the foam. If it cannot escape at all (foam to foam) it just goes to work trying to eat its way out...!
Andrew
That is exactly what I was thinking. If I remember, I will try and take a photo of the "damage".
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We have had excellent success at our club (Scale Rails of Southwest Florida) and on my home layout using "Alex Fast Dry Acrylic Latex Plus Silicone Caulk", From Home Depot it is about $22 for a 12 pack of tubes.
I have used it to glue blue foam together, attach foam inclines to each other and to my layout board, and to put cork roadbed on wood and on foam. It takes a bit of time to setup, but that also means it is easier to adjust if you need to slide something one way or another.
dwight77
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