Texturing mesh used smart uv project makes weird lines It's not always happening, but it happens often. Look at below image, it's used smart uv project:



And when I try to painting this, I can see some weird white line:


I don't like using smart uv project, but sometimes my uv map looks crap, it's useful.

This is not a first time happens, I see this many times so I tried to not using smart uv project as possible.

How do I get clean result on texturing with using smart uv project?

Any advice will very appreciate it.

P.S.
This is link for model:
https://drive.google.com/open?id=0B2NonO-YN8ayZVQ0VHhYSlY2UU0
Possible duplicate of:
Texture painting margin size
Texture Painting - Black Artifacts

Note that you can add margin with Pack Islands with pressing F6 after do Pack Islands. I always try 0.03 and works 100% fine.