I wouldn't put the permethrin in a dust bath.
It is a powerful drug.
Personally, using a dust was too fiddly for me.
I have always found permethrin in a spray. A quick spray under each wing, and under the vent while everyone is on the roost. Easy and fast.
During the day rake out all bedding, sweep out all dust. Spray the coop, a light spray all over. Air it out, it will be fine by night. Yes, put in fresh bedding etc.
In about 7 days repeat.
Then you are done!
It is a powerful drug.
Personally, using a dust was too fiddly for me.
I have always found permethrin in a spray. A quick spray under each wing, and under the vent while everyone is on the roost. Easy and fast.
During the day rake out all bedding, sweep out all dust. Spray the coop, a light spray all over. Air it out, it will be fine by night. Yes, put in fresh bedding etc.
In about 7 days repeat.
Then you are done!