Cheap knotty pine was fine for this location because of the good overhang. I repeated the bullnose sill using redwood. The outer layer of side and top trim (it's a two-layer design) was biscuit-glued at the corners and installed as a frame, which greatly reduces the chance of the seams showing after several seasons of expanding and contracting. Installing a "frame" assembly like this for trimwork is always better than nailing them one piece at a time.
So with a coat of primer and two coats of exterior enamel (and after double-caulking all seams), the final elegance came shining through.
As for surface finishing of the window itself, aluminum-clad wood windows (like these Pellas) need no maintenance beyond regular window washing. The cladding has a factory-baked enamel coat. You simply pick a color.
The bare wood edges, however, absolutely require surface treatment — and it's important to do so immediately after installation, or else the warranty is void in most cases. Since these are casements, the edge can swing out far and wide and get full weather exposure. The rubber gaskets also come into tight contact with the wood, with some sections rubbing slightly. It's just how they function. So the best finishing for these surfaces is not any kind of coating that would snag the gaskets, but a sealer — a parafin wax. Wood wax comes as a gel that can be brushed into all nooks and crannies. Then a wipe down of excess is all it takes.
I guess these Pellas turned out okay.
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