What no one has mentioned is that for best flow out rubbing on shellac from a can is that its better to dewax it first. This makes the finish more durable. What I do is take a mason jar pour shellac from the can into the jar and pour an equal amount of denatured alcohol into it and seal the jar. Let it sit undisturbed for about a couple of weeks and you'll notice the wax settling onto the bottom of the jar. Now take the contents of that jar and pour it into another jar WITHOUT disturbing the settled wax. The idea is to leave the wax in the first jar so you might want to use a paper strainer to catch any wax that gets kicked up during a pour. Now you can use the shellac that you just poured into the second jar for you rub. When I do french polishing I mix my dewaxed shellac to the consistency of a spit coat which a 1 part shellac to 4 parts alcohol. For my charge pad lubrication I use baby oil VERY SPARINGLY and to keep the pad moving in different areas all the time other wise you'll reactivated the previous thin layer of shellac you put down. If your pad starts to grab the surface then you've reactivated the shellac and its time to stop or move to another area of the piece. You should see the alcohol "Flash" as you wipe on the shellac (a wet film of alcohol left behind the pad then disappear as you move it over the area) What its doing is evaporating.