Yup - The sprays are just fine. A little more of a challenge to keep a steady dose/exposure going on prolonged encounters but still usable nonetheless.
I’d advise against it. P79 does not go that well with many of the fallout pheros and can give extreme and highly unpredictable results. Remember that it can amplify all the bad aspects as well as the good and the sort of pheros that steer P79 in a good way are not all conducive to fallout - In fact some (like alphanol) can contribute to killing these properties stone dead.