I am a huge fan of Fluid Film, as I take off or replace parts I always have a can on hand to touch up/ re spray any missed parts. I also recommend the Eastwood internal frame coating. I have never tried the 3m products but with the quality of items they make I'm sure it would be a good bet. I also use CLR for small surface rust and a wire brush.
I'm a big fan of Herculiner for the tub. mine has held up great and you can't beat the price. I am not a big fan of lining the underside. Makes places for moisture to get trapped, you can't get it 100% sealed. i'm all for paint to keep things protected on the underside. you can also find new strikes easier. Was that scratch always there?
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