# Issues with materials and disappearing lines **URL:** \ **Category:** SketchUp\ **Tags:** materials\ **Created:** [February 1, 2017, 4:36am UTC](https://forums.sketchup.com/t/issues-with-materials-and-disappearing-lines/38317 "2017-02-01T04:36:10Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![lezleesharp](https://avatars.discourse-cdn.com/v4/letter/l/d78d45/32.png) [@lezleesharp](https://forums.sketchup.com/u/lezleesharp)\ **Post date:** [February 1, 2017, 4:36am UTC](https://forums.sketchup.com/t/issues-with-materials-and-disappearing-lines/38317/1 "2017-02-01T04:36:10Z")
I’m going crazy. I know this is something logical but I can’t figure it out. Sometimes when I apply paint to a surface, it only partially accepts it and you can see different parts of it from different angles. Like this ![](https://global.discourse-cdn.com/sketchup/original/3X/0/f/0f53ab5c3580b832ff61aad93e84827df7b44068.JPG) Similarly when I am looking at a front view, some of the lines disappear. Please help me…someone…anyone… Thank you. ---
**Author:** ![ViggoPaulman](https://sea2.discourse-cdn.com/sketchup/user_avatar/forums.sketchup.com/viggopaulman/32/261002_2.png) [@ViggoPaulman](https://forums.sketchup.com/u/ViggoPaulman)\ **Post date:** [February 1, 2017, 7:56am UTC](https://forums.sketchup.com/t/issues-with-materials-and-disappearing-lines/38317/2 "2017-02-01T07:56:26Z")
Apparently, what you’re experiencing is called **[Z-Fighting](http://sketchup.wikia.com/wiki/Z-Fighting)**. That basically means there are overlapping surfaces with no thickness and SketchUp doesn’t know which one to show, so it shows both and you get that flickering effect. I see you’re drawing “flat” furnitures and apparently, added a separately grouped window-glass to the cabinet. In this case, to avoid the Z-fighting, I’d explode the glass or only apply the material to one face of the flat furniture.