yeah I've creemed 2 tanks works well. even with just the sealer its like a big bottle of elmers glue. pour it in, and turn it over, and over till it drys be sure to have all day devoted to doing it it takes a while to set up.after you get the whole inside coated you leave it for an hour, then come back , and turn it over some more then leave it on a different side each time it says one bottle for every five gallons.
after its semi solid, and not running blowing compressed air through it for a few hours will speed up the drying a good warm day in the sun will help too. the three stage kit has a echer, it says to wash the first stage out with water, and it comes with a water remover second. then third pour in the creem.
I'll give you a hint throw a couple hand fulls of small nuts, and washers in the tank while using the echer helps a whole lot to etch the inside. just make sure you have goten them all out after. also make sure not to have big rust spots because that etcher will eat right though the tank if theres too much rust trust me!
Oh BTW it also will seal small holes in a tank too I had that problem about 2 1/2 years ago it sealed it right up! well untill it was jarred then it starteed leaking again thats when I ripped the bottom off, and replaced the damaged section