My cowl paint job didn't match up. What I did was get some Great Planes striping trim - I think I got 1/4" red and 1/8" white. You can extend or 'move' the lines wherever you need to, and it came out looking AWESOME. Sold the plane, so sorry I don't have any pics.

Ok, now I remember. I added some pin striping, so that's why I had the white trim tape. For the stock scheme, you just need 1/4" red trim tape. Wrap it so it's even with the red covering at the fuse and around the front of the cowl, either ending at the breather holes or wrap it just under and go all the way around.

I chose to do a 1/8" white stripe evenly spaced above the existing color line. I searched for pics of full scale planes on Google Images and modeled one exactly. Really came out spectacular, and only took a half hour and five bucks.

Edit: What I did was put a 1/4" red stripe 1/4" below the line where the red meets the white, and a 1/8" white stripe 1/8" above that line, so I had a few nicely spaced trim lines.