I've thought about (and tested) the tray type windage tray vs. the screen type windage tray theory. Some people believe the solid tray type --the oil will bounce off of it and throw the oil back onto the crank worse than without a tray at all. I've always thought of the water balloon fights I've been in (lol) and remember having many balloons bounce off of people and not break . But throw a balloon at a chain link fence and it breaks every single time. I think of a oil droplet the same as a water balloon and "see" the oil returning to the bottom surface of the oil pan with a screen type much more efficiently vs. a solid tray type. I'm pretty sure screens work better than solid trays. As for polishing and Glyptol--I don't give a crap about polishing--too little ROI, but Glyptol is fast and I believe achieves the same thing. In the end it looks so professional and I've never seen it come off when the cast iron is prepped and clean correctly. Oh and liquid on a smooth surface will flow faster than a rough surface IF there is enough volume. Kevin is thinking about a couple of drops of water on window pane I think. A little bit of water on the window at first and yes the water takes time to start its way down the window--we've all seen this- once there is a ton of water it flows like a river. I've tested it and a screen type tray is more effective than a solid tray type at returning oil to the pan. <<Caveat--This is what I observed when I tested it. Cool build. J.Rob