Tom:
I have tried using the SUDS-O-GUNS attachment from both my Kirby 514, and, although a long time ago, from a G4 model. They work IF you can cut whatever you are spraying to the consistency of water. So, if one is trying to white-wash something, or spread a VERY thin layer of wood protection, you will be fine. The down side is that VERY few products give the user a break-down on the mix to use (for that "water-consistency" brew). What I have found helpful - and this is just me, not any manufacturer, is a mix of a third of "product" to two-thirds water. Then, again, too, I have found that taking the "screen" part off the SUDS-O-GUN unit is advisable. I believe that it is only used for creating suds (with the Kirby shampoo). Good luck, my friend. P.S. I have managed to successfully "spray" bushes and to stain part of my deck....so it DOES work. (Aside: steer clear of windy days if you are using this outside - I've coughed from the foliage spray, and have stained glasses from when I thought that I was immune to Mother Nature!)