Spray shellac is nice and works great. Because it is sprayed you are assured there is no wax in it, which is the most important feature of a good shellac, especially when using as a sanding sealer.
Spray shellac is really thin I would guess less than a 1 lb cut, which means if you are using nothing else you will need loads of spray. I am referring to ready made spray in a can. With an HVLP you can adjust the shellac by making it yourself which to me is one of the most forgiving finishes you can use. Easy to apply and easy to repair.
Because of the ready bought spray being so thin I do not suggest you use it alone for a floor. I use the spray as a first coat and then add two more coats sanding in between for a floor application. You can also add several coats of wax after the spray if you want to.
One poster Jesse Cloud suggested a way to apply the shellac in this thread and he was spot on.
He states:" For an easy low tech, natural looking finish, get a spray can of shellac. Spray on several coats (15 min between coats). Let it harden for a few days, then rub on some paste wax with steel wool. Easy to do and it looks great."
Great suggestion!
You can also spray the shellac, then use steel wood for sanding between coats or better yet a scotchbrite pad to eliminate the little metal slivers from occurring. Finish up with a coat of wax like Jesse suggests. If only using spray, for more durability and resistance to alcohol, use the wax as the last coat if using for a table top. Buff to a shine.
Nickao