As for the gummy on top of laquer based you will not feel it being gummy it will wet sand off easily it just gums up sandpaper til you get that microthin layer off. what that does is to help make the finish rock hard and draws all stickiness out of it. Fiberglass and gelcoats do the same thing. I was plant manager for a while at a fiberglass boat factory and we went through a lot of sandpaper to cut that layer what it basically is is wax that is mixed in with the resin and paints to seal it off as it hardens which gives it a nice hard finish.

Joe