Conductive paints are a gamble. You can do them with a brush instead of a spray, which is better, but... still a crapshoot. Many conductive paints require multiple coats to get any real conductivity. They also require specific conditions to apply them, and usually require 24 hours between coats, also depending on climate conditions. It's a lot of work and likely some headaches that may or may not pay off at all. Even if you get it good at first, the paint can eventually flake off and lose it's conductivity as it ages. It might still be better than nothing, but the labor involved doesn't seem like it's worth it to me.
If conductive heat shrink would work, I would try that first. If it works, cool.