how do you paint a seam out? my mesh(textured) has a blank line where I mark a seam on it.
Be sure you are marking the seam correctly in edit mode first off.
(assuming you use blender 2.5)
Go to edit mode and using edge select chose the edges you want to mark.
Use ctrl+e and select Mark Seam, or you can use ctrl+e and then ‘a’ if you want.
The seam should turn red (does in mine anyway)
Make sure you have overlapping pixels. It is the Bleed setting. In 2.5x it is under “Project Paint” In Texture Paint mode.