1 Gallon 4X Spray Pattern Indicator Dye + Surfactant, Makes 128 Gallons of Wetting Agent for Lawn & Turf Mark - Effective Spray Indicator, Liquid Blue Dye for Marking Turf, Easy to Mix & Apply

Functionality:Did the job and made spraying pre emergent a breeze

AAA++++

This stuff works, it marked where I sprayed so I didn't apply in the same place twice. I recommend following the directions closely it only takes a little bit of this stuff to mark your yard. It will absolutely stain anything it comes in contact with so be careful around driveways sidewalks edging etc. I wore gloves and I'm glad that I did and figure that your shoes will be blue too. Interestingly enough it did not stain the inside of my backpack sprayer, I figured that I was going to have a blue tinted sprayer from now on. I like that it also has the wetting agent already added to it too. It does take a long time for this to dry on the grass though. For me it was about five days and my wife was not happy about having to walk our 2 dogs down to the vacant lot for them to do their business.

Great visual aid in spraying lawns.Mix as directed and you will see where your product was last applied with a blue hue.The spray dye eventually disappears with rain or next lawn cut.

This have great color with just a small amount also there is no clogging in the filters

I use this with Speedzone in a Ryobi 2 gallon electric sprayer. It works perfectly. Washes off concrete after several days with rain and water, so spills and drips aren't the end of the world.It sprays well, with no apparent impact to the viscosity of what you're spraying.A little goes a long way, so don't overmix it. In fact, you can even put a bit less in than the label says and it'll still mark the area you sprayed with enough color to be useful. Meaning that you get even more than you're paying for.

I don't write a lot of reviews because I have such a high volume of Amazon orders. But this is definitely the best marking product I've ever used. And I've used a lot ! It mixes well, requires less product than other brands I've used, and gives an adequate amount of color. I also like that this one has surfactant, eliminating the need to buy a separate product. I have bought this 2-3 times already.

Works as intended - keep it off your skin and driveway