A method for coating a vaporizing substrate includes depositing a film coating 12 on at least a part of a substrate 10 during the time when the substrate undergoes phase transition from essentially liquid phase to gaseous phase, where the substrate includes a chemical substance that participates in chemical deposition reaction(s) in gaseous phase, the gaseous species 101 formed upon vaporizing at least the portion of the substrate material, when undergoing chemical deposition reactions in gaseous phase, produce particulate 11 that forms at least one coating layer to produce the film coating 12.