I have found another thread about this, I would love to have an answer from oldred. He seems to post the most about these type of topics.
First, what I have realized is, all the negativity about getting a secondary tank, is u need to increase ur CFM and that going from a 60 gallon tank to a 80 gallon tank will only make a little difference. As quoted from oldred "adding a larger tank will allow it to run a bit longer (usually less than a minute or only seconds). But I am going from an 80 Gallon tank to a 250 gallon tank. That is a big difference.
Secondly, If there is no reason for a secondary tank, then why is it that they sell them for this purpose, and I have went to several high end paint companies, and a majority of them have huge reservoir tanks? Some upwards of 2500 gallons
Here is the other thread.
adding on a extra compressor tank