this might help: https://www.hometalk.com/32402167/how-to-seal-coat-a-driveway
Hi Russ: First of all, be sure that you are having a reputable company do the work and check them out with the BBB. In the spring, a lot of fly by night companies pop up and leave you with a crummy job and no money:( The main components of the blacktop that is used on asphalt driveways are rock, sand, and asphalt cement, a tar-like petroleum product. A new driveway starts with a 4- to 8-inch layer of compacted granular fill for a solid, well-draining base. In many cases a 4-inch thickness may be adequate, but 5 or even 6 inches of full-depth asphalt will assure you of a stronger, stable driveway under a wider range of climate and loads. As an option, some contractors use 6 to 8 inches of compacted aggregate, or gravel, as a base for 3 inches of asphalt pavement. It is best to let your asphalt driveway cure for 6 or 9 months at the very least, before you think of sealing it. Sealing a new asphalt driveway before it's time is the kiss of death. The sealer locks in the light-weight hydrocarbon oils that give the asphalt its flexible nature.
Here are a couple of sites that may help, but I don't exactly know what your question is:
If your driveway is in good condition and only requires a topping then you can do it yourself. There are some excellent asphalt coverings on the market so do not go cheap or you will have to redo it is sooner than necessary.. Wash it really well and remove any oil spots with an oil remover. Be sure it is clean and free of dirt. You will need old shoes, a good roller with a long handle, plastic tray and the correct amount of resurfacer when you start. You might need a brush to go along the edges of a building or wall. Do this when the sun is not out or it will dry too quick and you will see the join marks. Block it off for the desired drying time so no one walks or drives on it. The best time to do this is when it is cooler in the evening or after 4 p.m. It should be at least 60 degrees so that the liquid flows nicely.