I am not able to paint on the whole model. I tried many times but nothing worked.
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no I can paint on some surfaces as you can see on the pic but it doesn't allow me to paint on some others ;( – iAlbert180 Mar 02 '18 at 19:09
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There are several issues with your file, all contributing to not being able to paint on all your model:
Materials
The material that is displayed in the viewport is only applied to a few of the faces in your model (the ones you can paint on). Go into Edit Mode, select all faces in your model by pressing A once or twice, select 'Material' in the list of materials and click Assign in the material panel:
Based on your specific file, the object should now be black.
Normals
Still in Edit Mode we can address the second problem.
Some of the faces in your mesh are inside out. This is due to having internal faces inside your model, which confuses Blender into not knowing whether a face is inside your model or out. A quick fix for this is to open the Properties panel in the 3D View (press N to open it), navigate to the Mesh Display panel, turn on Face Normals (the cube icon) and increase the size a bit:
This displays the face direction in the viewport in the form of a line coming out of the centre of a face. The 'direction' a face is pointing is called its 'Normal'. Any faces that don't have a line coming out of their centre are inside out.
The faces I have selected here are inside out:
Select them, press Space and search for 'Flip Normals' and press Enter. Their 'normal' direction has been flipped and they should now have lines coming out of them showing the direction they are facing (outwards). The lines were there previously, but they were pointing inside the model.
Face Selection Masking
The third problem is that you have 'Face Selection Masking' enabled in the 3D View header, meaning only faces that are selected in Edit Mode can be painted:
Either deselect the 'Face Selection Masking' option or select all faces before starting to paint.
Ray Mairlot
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does not work at all!!! I did what you told me and still the same issue... ;(((( – iAlbert180 Mar 03 '18 at 12:15
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1Upload your file to here, making sure to pack your textures (save the file afterwards) then use the 'edit' link under your question to add the embed code it gives you. – Ray Mairlot Mar 03 '18 at 12:24
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try painting on parts like the windshield or the hood, some areas work but some don't – iAlbert180 Mar 03 '18 at 17:55
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@iAlbert180 I have updated the answer, but I'm not sure if it will solve your problem as you didn't pack the textures like I suggested in my previous comment. – Ray Mairlot Mar 03 '18 at 18:18
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I did that and not i cannot paint on the hole model even tho on the UV map it shows and now I have some sort of line going on my brush – iAlbert180 Mar 04 '18 at 14:01
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1@iAlbert180 I can't help you if you don't upload a blend file with packed textures. In one of my previous comments there is a link showing you how to do this. Save the file after packing textures, re-upload it and use the edit link under your question to add the new embed code. – Ray Mairlot Mar 04 '18 at 15:47
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@iAlbert180 I have updated my answer. I do those exact steps on your file and I can paint on all of it. – Ray Mairlot Mar 05 '18 at 16:49
