We often recommend “spraying to the point of runoff” when treating exterior siding, tree trunks or object standing upright and vertical. So what exactly is this “point of runoff”?
Basically it means to keep your sprayer flow slow enough so that the mixture being applied can be absorbed by your intended target without excessive waste. The impact of gravity when spraying the side of your home will cause the liquid to run down, towards the ground. The same will happen when spraying a tree for wood borers and interior walls for pests like silverfish.
When using our MINI MISTER for inside applications, treatments usually stay where directed because the machine releases a light mist, not a liquid. But when using a PUMP or HOSE END SPRAYER, the liquid flowing will quickly accumulate on surfaces and start to run downward or in some cases, sideways. For outside treatments, this is normal and to be expected so its inevitable. But when treating inside – especially if you’re spraying a wall or piece of furniture – you generally want the surface to “catch and hold” as much of your mixed solution. This means a lower flow from your sprayer will be needed for anything vertical.
Of course, taking objects (like furniture) outside and laying them down can help keep the mixture where it can have the most positive impact. Do this when possible to minimize loss. But for tree trunks, shrubs and the sides of your home, you may want to “stagger” your spray by moving quickly over the area needing attention and then circling back to spray it again a few minutes later.
In summary, there is no advantage to having excessive over spray when treating specific targets like furniture. And if you notice us using the term “point of runoff” in any of our articles or hear us use the expression when talking to our support staff on the phone, it means to keep your treatment flow of mixed solution under control and focused.
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