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There are some other products which are POR-15 like.
Three of which are:
Zero Rust
Rust Bullet
Rust Encapsulator
I just bought two quarts of Zero Rust. Apparently its a heck of a lot less toxic than POR-15, and is safe to spray if you are interested in that, rather than painting with a brush.
Prep work is key. Marine Clean and other products like Naval Jelly all use the same active ingredient: Phosphoric Acid. You can buy this stuff super cheap at Home Depot and mix up your own batch, rather than spending a bunch of money on a pre-made product.
I would take the time to whire wheel/brush everything before, then use the acid to neutralize the rust, then use your rust preventing sealer.
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