I have never used one but if your product has mixing instructions for such a device it should be fine. I would think though it might be hard to get good coverage if you are spraying fungicides or insecticides as you will need to get under the leaves as well as on top. A good 2 gallon hand sprayer is less then $40.00 where I live but you might need more than one if you have some sprays that can't be mixed such as sulfur and horticultural oils.