Once you learn how to use it, this stuff rocks.
I recommend ordering some white spirits in addition to this. I watched a quick youtube video online about how to use this stuff and it was pretty easy and straight forward although i'd not have thought to use it this way. Basically you apply a few light drops of this stuff, let it dry, and then get a clean brush damp in white spirits and use that to brush the streak down from the drops you placed earlier. I used this in combination with some Tamiya weathering kits to add effects to my USS Arizona build and it worked out pretty well. It's work out even better on something I wanted to more heavily rust.
great rusty color
This is an enamel based products, so it will stick very well to acrylic paints. I like to add some streaks, wait about 5 minutes, then streaks it more wit ha brush damp with AK thinners. I also thin it about half and half with thinner and use it as a wash on mufflers and tracks.
Good product
This one is enamel based, so if you are using enamel paints, better leave you model for some good time to get properly dry, or you might damage your paint. Very easy to use. Apply one layer of enamel thinner, add streaks, leave the to dry, use another layer of enamel thinner to remove extra colour and that is it.