[Hammered]

You need to be very careful about combining metal etchers and etch primer. I missed that the first time I looked at your post. I would use one or the other.

If you use the phosphoric acid, do small areas so you can neutralize and dry before moving on. I use a thoroughly damp rag to neatralize and then follow up with a dry lint free paper towel. Definitely use a good degreaser.

John