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I'm following Blender Guru's tutorial Donut series.

After completing the modelling and sculpting I noticed I had more than one million polygons, so I reduced it by using Decimate modifier. After that, I couldn't Texture Paint on the mesh. There are some lines and when I try to draw on them, the lines appear in the hall area.

Here is the link to my Blender file enter image description here enter image description here enter image description here

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Your unwrap was probably bad, you must have had faces overlapping in your UVmap, I've redone it:

  • Select the whole mesh in Edit mode, switch to Face Select mode, select one last face to make it active, press U (Unwrap) > Follow Active Quads:

enter image description here

  • Paint:

enter image description here

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  • $\begingroup$ THANK YOU for solving, now Texture Paint works perfectly $\endgroup$
    – lara pauk
    Sep 6, 2020 at 18:23

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