If I'm truing an older wheel whose spokes nipples are sticking to the threads and causing spoke wind-up, I put a drop of ProLink on each spoke nipple at the head of the nipple (so, tire and rim strip must be removed). This allows the threads to move much more easily. If the wheel is pretty high-tension, this practice doesn't add much danger of spokes loosening from road noise. For a rear wheel, I'd only do this for the drive-side spokes (which are usually the ones that experience wind-up, anyway).
This practice may also be useful for more recently-built wheels whose spokes are sticking to the nipples.