"Slinging" and "popping" the film may be counter-productive. A wetting agent works by allowing the water to flow off as a sheet, rather than breaking up into smaller drops. When you shake off a large amount of the water, the water left on the film will be more likely to break into smaller segments or drops, and will be less likely to flow off of the film without leaving marks.(posted 8494 days ago)David Carper ILFORD Technical Service