Photoshop mask fringing

HAWK12HT

Hey all, So getting a really horrid gap (fringing) 1 pixel when doing mask selections from RGB channel. Have gone to every possible photoshop site and still no luck. 

If I keep filling in the mask with color the issue seems to go away but its annoying, defringe dont help either. I am working with 4k image. 

CreativeSheep

Still having problems ?

HAWK12HT

Well I did lots of blending of edges to get over my problem but did found a solution I guess, have not tried this in my case but pretty positive it will solve the problem. 

http://www.mrbluesummers.com/4054/3d-tutorials/semi-transparent-layer-rendering-in-3dsmax

This is the final result I got, the vehicle had several layers (paint, metal base, metal damaged etc) that were causing the issue when layered on top of each other. 
http://http//polycount.com/discussion/166109/recon-08#latest

CreativeSheep

Can I see the texture you're having problems with; unless you are positive you solved it ?