I ended up with an extra bottle of the old-style 2-part Eastwood Rust Converter, but I’ve only got “Part A” (12556ZP). So here’s the question… What did “part B” do? Did it just dilute it, or was it actually some type of activator? Being as though I’ve got a whole new bottle of “part A”, I’d like to be able to make use of it. Any advice? Is there something else I can use as a substitute for “Part B”?