Filling a line art create a low opacity line outside of the selected area.

[Scarslatte]

I created a line art then selected it's interior, expand it then paint it to fill. 
When painting or just filling with alt+backspace it's leaving a low opacity line at the other side, outside the selected area, that bothers me because interfers with the outside stroke that I'm gonne put. How to solve?

[Kevin Stohlmeyer]

@Scarslatte what zoom level are you at? How does it look when you are at 100%

[Trevor.Dennis]

It sounds like you are doing this on a single layer.  We can only guess at the set up here, but if the pale yellow is on one layer and you need to fill the gap between, then use a new layer further down the stack, and paint behind the pale yellow.  Or am I misunderstanding?

[Claire H.]

Hi @Scarslatte, I'm just checking in to see if the suggestion helped or if you are still running into this issue? Let us know how things are going. Happy to keep troubleshooting with you if needed. Thanks! ^CH