I am currently making a scene, and I kinda made a object (W.I.P.), but it is weak like grass, breaking on touch, no matter what material is painted in the mat file, even if it's metal, it still breaks on touch... And, yes, I am using the exact same mat colors from the base materials.ini file.
Here's it's ini portion:

And here is the .bmp (made with gimp, with cortex command's limited pallet)

Any way to make it at least as strong as bunker concrete? Yes, the mat pixels match the fg pixels in place exactly.
(By the way, it is currently a bunker module for testing, instead of a scene object)

only thing I can think of is your not paletted in the material palette. There is a different palette for sprites then for materials. There isn't a seperate bitmap for it, it is only embedded in the pre-existing. mat files.
If that isn't your problem, I'd dig around through the mod making forum, I think I remember something like this in there...

More than likely is a problem with your images all being aligned properly.
Make sure the MAT, foreground and background are all lining up right.
My custom mat was disintigrating too on touch, and I found that was the problem.
If worse comes to worse just copy it into an existing mat file and eyedrop the colors over.

Yeah, it wasn't in palette. Try this one.

oh damn, i put roon3's bunkermodule into the normal palette..
actually, no thats not true, i put the FG sprite into it.
woot, im not in trouble
his still fell apart like this though.

I didn't knew that mat files used different palletes, thanks.

Telltale sign is if your areas marked as background show up as dark brown instead of purple.