Spray or Pump?
Sprays develop their advantages, where natural borders are set to the pump system.
In the course of the spray discussion, pumps were often publicised as "spray alternative". Everyone knows this forerunner technology of the spray principle. The question, whether spray or pump, is not generally to decide, but product-related. The fact, that with the pump no even but just damp distribution of the active substance is possible, can be quite accepted for some applications - but not for lacquer.
The argumentation that pump containers contained 100% active substance, thus cannot be confirmed. Unless, you explain solvents or water as active substances. Because in difference to the sprays, pumps form no classical "aerosols" (state of suspension of finest particles in the air), but spray irregularly moisten to wet active substance solvent clouds. Pumps ensure besides no evenly high pressure up to the empty spraying of the can. Due to these technical reasons, the lacquer has to be applied with the classical aerosol can.