Sure thing I use the best fine line tape ( the yellow tape next to the green ) I have found its made by Colad it comes in tree different widths and will give you that sharp edge you want. I use a laser level to check that everything is strait along with a fabric tape. I am spraying another cobra next week I will see if I can get a few close ups of haw I do it. If there is something in particular you want to see let me know and I will do what I can.
We will finish all your unfinished cobras see what we are working on @
www.eddytheb.com