I am building a 1/700 scale IJN Akagi and the technique I am using is from an article in the Dec. 1996 issue of Finescale Modeler. It details how to use Acrylic flourescent light fixture glass. Specifically a type called cracked ice. You simply cut the shape and size you need, trace the outline of your ship model with a permanant marker onto the smooth side, flip it over and paint you bow wake, propeller wash, etc.. in white on the rough side, then paint the entire rough side in your choice of blue or other suitable ocen color. Then you simply clean the maker marks from the smooth side with WD40 and attach your model.