At the end of two hours there should be no clear liquid and little, if any, creaming. A clear liquid at the top of the solution is usually the solvent. Solvent separated from the solution is likely to damage plants. It may mean that the emulsifiable concentrate is not properly emulsified. After 24 hours there will be separation of the components of the emulsion spray, but it should take on a uniformly milky appearance again with only mild agitation.
Aerosols are particles dispersed in gas.
The liquified-gas aerosols consist of a toxicant dissolved in a liquid and held under pressure in a container. When the valve is opened, a fine spray emerges. The liquid solvent quickly vaporized leaving the small toxic particles suspended in the air. In general, there are space aerosols for control of flying insects and contact aerosols for control of ants and roaches. The main difference is the amount and type of toxicant dispersed.