I love POR-15. It costs $49 shipped for 1 quart and it does a whole car (2 coats). It is worth it!!
Go to www.stoprust.net
A gallon is $123.75 at www.por15.com
and that will do SEVERAL frames.
I don't know about the "Encapsulator," but POR-15 applies with a brush. You can't get any easier than that.
And it takes at least 5 days for it to come off your skin. I've gone to work with horribly stained hands. Wear gloves and a long sleeved shirt. I knew I had to, but I ran out of gloves and brake clean while I was finishing my work.