'Gouge' and 'lens' in the same sentence is nausea-inducing, but the ink fix really does seem to come to the rescue. I'll practice some fine lines of application on some old eyeglasses with gouges, wisps and canyons of damage...then, with steady hand, give it a try if tomorrow's prints come out negative. (bad pun). Regardless, this gives me an idea about what to do with the mine-field surface of a 150/2.8 Xenotar picked up from that fellow who bought/sold hundreds of them a few years back on the auction site.
Just dab some ink into the gouge, then wipe gently at right angles to the gouge with some paper towel stretched across your fingertip. Do it again if it doesn't fill in the gouge the first first time.