Re: deleating the seams between the door jam and the floor???
Bedliner on the floor is the way to go if you don't want the rust. You could also find the low point and drill a hole to allow water to drain. If you take that fin out you will have nothing to hold the weather stripping and it will let a lot of sound in, as well it might cause some door alignment issues. Bedliner is cheaper than replacing the floor in a few years.
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