I've experimented quite a bit with Caswell's brass formulation. I no longer tank plate with it. I may return to this eventually, but I presently don't have room on the bench with copper, nickel, zinc, and gold tanks. So I wand plate brass exclusively.
Here's my summary: Brass plate works best when applied over nickel flash. It also wand plates wonderfully over nickel. Did you try getting to nickel before using the brass plug n plate?
After the brass plate, neutralize well with water. Gently polish with a cloth diaper and Flitz polish. Do not buff with a wheel. Then, clean off with a good degreaser and apply a coat of lacquer.
I've tried it over numerous substrates. It works well on most. But it works best over nickel.
A major advantage of Plug n Plate brass is you can continuously draw from a fresh batch of brass solution. A tank of it requires attention to keep the pH right. But the sealed bottles still work after 1 year, for me.
Kind regards,
Ken
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