As it was my polane that was used to model the scum lines on the floats I would have to say they are correct. Because of the location and the way the spray flies away from the float sides, the only way they come off is with a sponge. The height will depend on many things, size of the floats, how much fuel is normally kept on board etc. They form surprisingly quickly, at least in the shallows of Alaskan lakes....
Cheers: T
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