Painting Engine bay before body

There is a special Soft Edge foam tape I have used that works quite well. Here is a link.The soft foam gives you a soft edge that easily polishes away.
www.hillas.com/Categories/Automotive-Masking-Tapes/3M-Soft-Edge-Foam-Masking-Tape-06297-13-mm-x-50-m-1-per-case.html?gclid=CjwKCAjwjIHeBRAnEiwAhYT2h_u9D-IYsrMdoAQXo-zrx0H1WOrQRt3kDWXn9lYrNFdCKDY-7bTTRRoCJd8QAvD_BwE