I have used Tar Gel Plus and FSA for many years. Tar Gel is a standard additive on all my jobs but I tend to only add FSA on commercial projects and days with rain in the forecast. In my opinion, FSA works best with sunlight. If I have a day with overcast, I am not as confident with drying times. I am wondering if there are any contractors that have used Fass-Dri additive. There is a significant cost difference between the FSA and Fass Dri and I am wondering if the additional cost is worth the money. I am also a results contractor, as we all know spending a few extra dollars to be sure our sealer is dry by the time the rain falls can be priceless. I would also be interested in feedback regarding sun,no sun, warm compared to cool temperatures. Thanks in advance for your input.