When everything was said and done, I ended up with two 12-16oz cans of whitewall paint. One seller describes it as a elastomeric polymer. One seller was from Anoka, Mn and the other from Ft. Dodge, Ia. The latter is only a hour away, but arrived last. I used the one from Anoka, but it's possible the are the same type of paint.
Just so you all know, the brightness of the white has slowly faded to an ivory color. Looks like dust/dirt but I washed them and it's still a darker shade than the first couple of weeks. The paint itself looks as if it still adhering to the sidewall with no problem. I think they still look much better than stock.
In the next few weeks I'll either put on another coat or try the second can of paint.