My garage roof leaks and forms puddles everywhere. I hate cleaning rust off "new steel" before I can paint the finished project, so ANY steel that arrives gets cleaned then painted with a coat of red oxide.
The red oxide also makes it a breeze to mark for cutting and in the case of the roadster to mark the bits as they are cut.
Sadly spent the day doing brakes on the lil pick up so no cutting yet.
ps. Sorry for the blury pic, phone camera sucks and the "real" camera drowned and has not yet been replaced.