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I use both a cup and disc in a 4 1/2" angle grinder to strip metal. It works well and leaves the metal nice and smooth.

I had a wire cup for my grinder i tried it on my trailers diamond plate it worked well but soon after it was turning the metal a black color but wasd still removing paint and rust.
Back then plan was to do the whole deck with the grinder wipe with DX579{ppg} laqure thinner and epoxy prime followed by paint.
I never got around to it but wondered if the blacking was going to be a problem?
Thus the reason for this thread. Just looking at opinons on What worked for others since a plan/system would benefit lots of apps.
Thanks for all the input so far