You are right again Ventilator !

I must paint the two sides of UV caus it's a mirror mesh wit ha half texture.
So by painting the two edges border , it fix and solves my problem.

we can make suggestions for fixing this projection painting problem at the blender forum
Yep, if you can make a suggestion for it , it would be cool to find it fixed in a fture release (no more need to "manually" bleed the texture).