Undercoating Questions

[Guy58]

Happy New Year to all,

I have a few questions about undercoatings;

What undercoating will give me the closest look to original?

Were the front fender wells undercoated the same as the rears?

Is it best to sand blast the areas before appling the undercoating?

If so, should I apply a chemical rust proofing after sandblasting are not at all?

I have been appling Napa's rust preventive before painting and it seems to work well. Is their a better product I should be using?

I finished the rearend this past summer, what do you think?

Thank you all for your help the past year,
Guy