Hi,
I know men are very visual so here are some pics of my painted engine compartment. I am going to detail suspension and replace steering bbox while engine is out.
The car is being painted by a professional in my garage. He sanded the hard line flat and will use a special tape which allows blending with no hard line. He is gong to give me the name of the tape and how it is used. I will post it for you. I think it is made by Scotch.