Hammer Texture Flickering

Hello, one of the brushes in my map seems to have a problem with textures. Whenever I apply a texture to it and move my camera it flickers between the texture I applied (cs_havana/stonefloor007a), and the original texture (dev/graygrid). When I compile it into GMod it shows up with the dev/graygrid texture. Any help would be appreciated, thanks!

See if there’s another brush inside of it.

You might be trying to apply the texture as a decal, use the tool that looks like this:

http://puu.sh/9UxX1/10770e1161.png

then select the face and change the texture.

Tried it, same problem occurs.

[editline]2nd July 2014[/editline]

Success! Thankyou very much!

For future reference, this occurrence is referred to as Z-Fighting.