Flash Point
The minimum temperature at which the vapour of a flammable product will flash (ignite) if a flame or spark is present as defined in British Standard 3442.
Flashing
A paint defect where the gloss level is higher in some places than others especially at joints or laps.
Flatting down
Rubbing/sanding down of a paint coating with pumice powder, glass paper, carborundum paper or other types of abrasives prior to repainting.