Do you know the cause of this foam latex damage?
It's GM foam and included with a brass armature.
The photo is not mine but my friend's one.
He said to me that there is a foam latex which is inclued
brass haven't caused a damage like this.
Now we have been searching the reason.
Then, dose GM foam contain any preservative for metal materials?
*I corrected the information on 7th April.
Hi, Brass is very destructive to foam. You should paint your armature with Zynolite (maybe spelled Zylonite?) metal paint-it's a spray paint. I built a dinosaur once with a brass armature and that dino didn't last long. Chris Endicott who worked for David Allen Studios told me about the paint.
Thanks for your advice! It's very helpful
I'm sorry but the first information was exact, it's included brass.
However, there is a foam latex which is included brass haven't caused a damage like this.
So we want to know whether GM foam contain any preservative for metal materials.
I don't think GM foam latex has anything in it to preserve metal.
I don't think any foam latex is good with brass, or any liquid latex either. Soft 2-part urethane foam is ok to use with brass armatures. So is Soma Foama, a platinum cure silicone foam. But not natural latex.
Steel will rust a little, from the water in the latex, but I don't think it hurts the latex too much. Brass and copper will go green, and make parts of the foam turn turn black or green, and deteriorate. But I have never seen the foam turn an even shade of black all over, like this photo! The texture looks more like carved polystyrene foam, painted black, to me.
Aluminium or stainless steel are best to use inside foam latex. Brass and copper pieces should be painted, or chrome plated, or wrapped in plastic to stop them touching the foam latex.