Clone Brush doesn't paint seam I been having this problem for years and been looking up tutorials and videos and can see people painting away seams super easily. I some times get seams that i can clone brush or texture over without any problems but in the same model i will have seams that will never go away. Pixel bleed has no effect on these seams.

The answer here doesn't work on my models. I also have that same potato file and my texture will paint over the potato seams but not the models i made.

How to remove/blur the texture seam?

Or in some of my other projects, i can't paint away a single seam using the clone brush or texture paint method (blending).

Doesn't matter how many times i re-mark and unwrap (i even tried smart uv unwrap). The normals of my object are all facing out, it's smoothed. The model textures i work on are 1024x1024 or bigger. Even smeared black, grey and white colors can't cover these seams, pixel bleed does nothing. I tried re-calculating normals and it didn't help either.

I make the model, apply a single material and generate a blank uv texture. I then mark seams as efficiently as possible and then unwrap. I go into texture paint and set the bleed to 2,4 or 6 but it rarely works. I have tried setting it higher but the results are the same.

I use seamless textures and paint over it, works on the potato file but a lot of my models refuse to let me clone brush over the seams. Some of my models have mixed results but ultimately they all have seams. 

I can upload some pictures if needed.



 (This last one is rare for me, even with basic objects)
Are you using Subsurf? If you are, do you have Subdivide UVs checked? Apparently this can cause seams to be exposed.
https://developer.blender.org/T26426
Try unchecking Subdivide UVs and see if it helps.

Also adding loops at the edges might help: https://blenderartists.org/forum/archive/index.php/t-343226.html