Eastwood's Rust Encapsulator is basically the same thing as POR-15, except that it can be topcoated without using a special tiecoat primer. I've got a quart of that myself and will be using it on the bottom of my box when I get to that point pretty soon. It's also nice that you can get this in spray-cans, which is what I used on my inner fenderwells, just so I could try it out. I was happy with how it went on and how it looked afterwards. Also, I don't believe the Rust Encapsulator is sensitive to ultra-violet light like POR-15 is, so it won't fade out without a topcoat.
