Unless it is a systemic antifungal it will wash off in the rain. No way to prevent it. I just spray after every rain.

why use hazmat suit. do you want to die. go Organic.

cheaper and better and safe.

I would get rid of all that stuff the correct way. talk to your town about how to get rid of hazardous material. It is against the law to throw it out. You are responsible for getting rid of it properly.

poison the environment you poison yourself. Stuff that requires hazmat suits most likely require use only by special trained and special licensed people. you are playing with fire. stop playing around GO ORGANIC.

blight is a minor nuisance. look into Serenade they sell it on Amazon. I prefer the liquid form over the powder form. it eats all the bacteria and the fungus spores.