If you can see the flaw, like a pit or scratch, then you can obliterate that portion of the lens with something like India Ink.

Obviously this also reduces the overall light transmission of the lens, and clearly isn't suitable if there is a substantial portion of the surface damage.

But if the spots are limited this ought to work fine. It's essentially going to cost you a partial stop.

Now, if the coating is gone and it just flares like an old fashion inflated triplet then I suggest you look for the old creamy dreamy look and save your money.