Jagged lines happens when I fill the color

Hi! help me please to figure out why there is jagged lines happens when I fill the color using face select mask. And those jugged lines happens only from one side

The upper is just pixelation because of the pixeldensity. The lower one is so perfect because there is a edge seam and you UV-islands have a distance… you may wanna add a aseem or just select the faces in UV and “move them away” ? (If this is color only you even may wanna have two different materials?)

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