I have found success using several different adhesives available in caulking style tubes. The one I am using now is a DAP product called ALL-PURPOSE, BEATS the NAIL construction adhesive. Any Home depot/Lowes type outlet will stock this @ around $3 a tube. Obviously you will need a caulking gun too.

Regarding the use of hot glue mentioned above...I'd be wary of that since the heat is going to melt/deform the foam and make a mess unless there is a method of using it in this application I am unaware of. Just my thoughts.

 

Bob

flanger posted:

Regarding the use of hot glue mentioned above...I'd be wary of that since the heat is going to melt/deform the foam and make a mess unless there is a method of using it in this application I am unaware of. Just my thoughts.

 

Melting can be an issue with exposed foam, but I have never seen a problem with foam core (which is what OP asked about). Even with the former, if you use low-temperature glue and wait for a bit of cooling before assembling, it is usually no problem.  The big advantage of hot glue is that it permits one to work much more quickly than with glues that have to set. IMO it is under-appreciated by many modelers.

--pete

 

 

My heart is warm with the friends I make, 

And better friends I'll not be knowing;

Yet there isn't a train I wouldn't take,

No matter where it's going.

                        Edna St. Vincent Millay

 

MaxSouthOz posted:

I use hot glue in my work, Pete.  But I've never been able to stop the spider webs from forming when I use it for modelling.

Is there a trick to it?

Sure! Incorporate them into your landscaping. 

--pete

 

 

My heart is warm with the friends I make, 

And better friends I'll not be knowing;

Yet there isn't a train I wouldn't take,

No matter where it's going.

                        Edna St. Vincent Millay

 

Elmer's craft spray adhesive works well on foam core.  Walmart has it.  Just be sure to protect surrounding areas from over spray.  

I also use it to attach ground covers on vertical surfaces.  Spray the surface lightly to make it tacky then put the ground foam on a sheet of paper or cardboard and blow it onto the surface.

BT

Ten 2" layers of foam mountains are growing on the layout right now.  Using the same  28 ounce tubes of Loctite premium polyurethane adhesive used in my wood work.

East wall knee studs 002Early photo

When using foam with facing it is best to peel it off to facilitate glue drying.

The mountains  I am making are light weight and easily removable for access to the "buried" track work.

Eternity is a long time to have been wrong.

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I would like to be sure you are asking about foamcore (a thin layer of foam sandwiched between cardboard sheets) and not extruded polystyrene, which is an insulation product used in home construction. I use or have used extruded polystyrene--pink or blue color, but normally the pink stuff--on a lot of layouts in various scales, and highly recommend it. It comes in 2" thick 4x8 sheets and is easily cut or carved, leaving no mess, with a hot foam knife (available at hobby shops, craft stores, and from Micro-Mark, among other places). The extruded polystyrene can be glued to a plywood base with Gorilla Glue or several other adhesives available at any home improvement store.

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