In theory, Turf Mark Blue Spray Indicator Dye would have an indefinite shelf life since it does not contain any active ingredients. However, you wouldn't store it in any location where it is exposed to the sun as the UV rays would impact it in the jug the same way they do on the lawn to help break down the color. It's also possible the saturation could diminish over time and you may need to use more the longer you have it to achieve the same level of color when spraying.
Turf Mark Blue can be mixed with Bora-Care with Mold-Care at the rate of 0.02 – 0.04 fl oz per gallon, which would be a total of 0.12 – 0.24 oz in the 6 gallons the mix of Boracare with MoldCare (5:1 ratio) makes for wood treatment.
Yes, wood can be painted after an application of Turf Mark Blue Spray Indicator Dye and Bora-Care. Keep in mind that the Turf Mark is a permanent dye, though, so it may be difficult to cover if a lot has been used. We would recommend using Turf Mark Blue at the lowest rate of 0.5 fl oz if you will will be painting with a light color such as white.
No, Turf Mark Blue Spray Indicator Dye would not reduce the efficacy of any glyphosate chemical, or any other chemical it is mixed with, as it is just a food grade temporary dye for seeing where you have sprayed.
Brick is quite porous and it can take a long time for Turf Mark Blue to wear off of brick that is sprayed with the product.
Turf Mark Blue Spray Indicator Dye treated wood can be painted over once the surface is dried. However, the Turf Mark Blue will leave a permanent stain on that wood, so your paint may not be able to cover it up. We recommend that you do not use any indicator dye on wood that will be exposed or finished with a paint or stain.
Without know exactly what they are spraying, we cannot accuratly answer. If you can find our exactly what they are using, we can better assist you. Turf Mark Blue Spray Indicator Dye is not harmful on its own.
