At 1/72 and smaller scales that bleached out white line is best laid down with an oil pencil or oil crayon like this:
As the bleached grass you're representing is not an even, uniform band of material, you work to lay it down in a slightly distorted pattern. After the white oil born pigment is on the model it is smudged and pushed around a bit with a stiff, short-haired brush, then finger and rag.
You can highlight the scum line with oil paints, as I did on this 1/96 SKIPJACK class model
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