To elaborate a bit more: there will always be personal preferences but there are different adhesives with different viscosities (thickness) for different purposes.
In general, the thinner the adhesive the faster the cure. Only use a thin adhesive when the tip has a perfect fit with a smooth nail plate.
A medium viscosity adhesive is good for general purpose use.
A thick or gel adhesive should be used where the nail plate is ridged or on a nail biter for example. The gel quality of the adhesive fills in the dips and cushions the tip for a perfect contact
Speed and accuracy is always important in a service so using the appropriate product is key.
As to keeping adhesive tubes and bottles usable: when using a tube with an extender nozzle, squeeze the tube just behind the nozzle, not from the bottom like a tube of tooth paste as the adhesive will just keep oozing out. When finished, remove the nozzle and clean it (they can be soaked in remover if necessary but if they are blocked, just use a new one as they are not costly). When the cap is on the tube roll the end up to keep all the product near to the end ready for the next use.
In professional services it is easier to use an oval bottle with a nozzle for other adhesives (other than brush on) as, after each use, you can get into the habit of 'burping' the bottle (squeezing the narrow sides to bring any adhesive left in the nozzle back into the bottle).
Make sure there is no product around the end before putting the cap back on.
Doing all this should mean any bottle or tube is ready for its next use
