Read his first sentence, er I mean disclaimer. Yeah, film works fine edge first.
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Any combination of stones that leads to a proper shaving edge is fine.
I use all sorts of progressions with the same outcome, a shave ready razor!
My favorites are a 1k/3k/Karasu Suita progession that I use before any finisher. Or 1k to coticule slurry, then finish either with the coticule or whatever else I feel like using.
Bram, once you squeegee the water from between the plate and film the film is well stuck to the plate.
You can do anything on film that you can with a stone, circles, half laps, X strokes. The film will not come off until you pull it off or it dries out.
It is a bit of a hassle, but it does work well and grits go to about 60k equivalent, though I prefer the 1um about 16k equivalent.
There are many threads and good videos on its use. It is just another tool, works well on very hard blades.
As said I often use a combination or just to finish. I did recently get a Gokuymo 20k that produce a similar edge to .3um film, without hassle, splash and go.