Weight Paint works on only one area So I got a problem. I recently started with Blender and I created this low poly character. I already rigged her and moving the bones works good. Now I wanted to do some weight painting to prevent certain bones to move certain parts of the mesh. The problem is that I cant use weight paint properly.

So here is my mesh with weight paint. You can see that when I select the bone the automatic weight paint works just fine.




On the second image though you can see the only part i can actually paint. Its only this specific part of the head, thats it. Someone ever had this problem and knows a fix for this?

Thanks for your attention!
The problem is in your Mesh. Go to edit mode, select all Polygones an then click ALT+N and chose recaculate outside.
That is because the Polygon have 2 sides. Front and Backside. You cant paint on the backside of the Polygon