The general Pest Spray mix that I use handles the Heat and Rain that our harsh Australian Summer throws at it and the Cold Winters really well.
It has to be very Mammal safe and have a long lifespan.
I will give 3 Months outside warranty and 6 Months inside warranty but you should get 9 Months from the First spray and then 12 months from then on .
Sometimes though it Rains or looks like Rain when your booking is due and this can cause a problem with bookings .
Being a water based product the treatment cannot be be done when there is steady Rain present or heavy Rain likely in the first Two hours from when the spray was applied .
After Two hours it will bond very well to Bricks , Wood , Paths etc.
Another reason why it cannot be used in the Rain is because the ingredients in Termite or General Pest's sprays cannot be be washed into the sewer system as it will hurt Fish as well as Insects .
A few sprinkles of rain won't hurt the spray , in fact , on very hot days I might even wet the home before I spray it to cool it down .
After it has been applied it really needs a very heavy downpour before it will affect the treatment , a little rain won't affect it .
As always though if you get a General Pest / Spider Spray carried out and you are still seeing activity after Two weeks I am only a phone call away and will gladly come out and have a look .
P.S - Looking out the window and the Sun is now shining , sorry I cancelled guys ....