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Let's clarify, too-foamboard, or foam insultation, but not styrofoam.  Different products.


Here's a great blog page that shows some of modeler Emanuel Noaillier's process to make buildings from foamboard:


[URL unfurl="true"]http://www.009.cd2.com/members/how_to/nouaillier_a.htm[/URL]


He peels the paper from one side, to work with the material.  I have not yet tried this, but I have some thin foamboard and will try it on a diorama project I have in the works.


As far as insulation goes, I use scraps of it for groundwork.  A hot knife is a good idea; a regular knife, or a saw, can cut it, but it makes a lot of dust.  I have a soldering iron, and I found knife tips that fit it, so I can use that as a hot knife to cut and carve the foam.


I also use wood putty (Elmer's) to coat the foam.  I like wood putty because I can get different textures, from using it for groundwork, to making surfaces like concrete, stucco, mud walls, and so on.  It can be tinted, for groundwork for example, with acrylics.  Or you can paint it, when it dries.  It can be thinned with water, to various consistencies.


Here is a dio base I made a few years back, with foam as the core for the base, and the building, and coated with wood putty:


[ATTACH=full]90142[/ATTACH]

[ATTACH=full]90143[/ATTACH]


You can see some different finishes here-concrete, stucco, dry bare earth.


I stuck the wall piece to the base with toothpicks and white glue, and the whole thing to the wooden plinth with white glue.


Hope that helps!

Best regards,

Brad


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