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.
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.