Unless the feathers became fully drenched, one heavy application of the powder usually carries my buddies and I through the entire 3.5 months of the bow season.

If the feathers are exposed to heavy moisture, we sometimes would refresh the powder....after feathers are fully dry. My nephew rarely refreshes during the entire season and rarely has problem.

One thing to think about; will the bristles of the WB scrape the protection off, requiring a periodic application?

I have also used Art P's method, and it works.