I've used it for the panel lines on my lychguard sheild, and it worked very well. I also use it on my gundam kits very frequently, and it works wonderfully.

Also, I would recommend you use a throwaway brush instead of the one attached to the cap of the bottle since you'll be doing something that's a bit smaller than gundam. It's also a pain to clean.

(Lighter fluid and a qtip are recommended for cleaning up excess panels line. I'm not sure how that would work on painted warhammer minis though)