I am a Remodeling contractor. I am having a good sized driveway done(3000s.f.). due to the stage of construction and with winter coming soon. I am going to have the binder put down, then top coat in the spring. The question for you paving guys is , What is a fair amount to hold back for the top coat? I'm looking to be fair to both of us,with enough to make sure he comes back or that I can get someone else if he doesn't,50%-50%/, 60%-40%? I have no idea. Thank you.