As a foliar spray, you'll see an immediate greenup, but it won't last very long (it sounds like you recognize this already). You'll probably see slightly better results if you add a small amount of baby shampoo to it. If it says it has a wetting agent or surfactant in it, that won't be necessary.

Another thing I'll point out is that when you use it as a foliar spray, you don't really gain anything by using a chelated iron product, since the iron is being absorbed directly into the leaf. It doesn't hurt to use a chelated iron product, but if it's more expensive, I'd go with the cheaper option.

A couple of words of caution are in order.

The label probably already tells you this, but the iron can cause permanent stains on any sidewalks, driveways, walls and so forth that it gets on, so make sure you spray on a day as wind free as possible and take great care in aiming.

The second caution is that an iron foliar spray can cause leaves to burn in hot weather. I would avoid it if the temperature will be reaching 80 degrees within a few days of spraying.

Hey thanks BP! I have not actually purchased the stuff yet but that info is good to know.

I have used the Chelated Micro Mix from Lesco and to be honest I thought I had better results from using Ironite. I did see reslults though, that were short lived as previously mentioned.