Too much flux will be if it is in a pile on the floor, after dripping off the bench.
I have some small 10ml bottles with a dropper insert, that are perfect to dispense flux, and have a good number of them filled for use, just remove the lid, put on a drop where needed and put the bottle down. With the tiny dropper insert it is slow to evaporate the alcohol solvent in the bottle, but it goes fast on the board. When doing SMD work a drop before application of the iron to the component is fine, and same for every rework.