birchwood casey, westlake market perma blue gun blue bottle with 25 cotton swabs for restoring guns and other metal items birchwood casey, westlake market birchwood casey offers you the best ways to touch up scratches and worn spots or even completely re-blue most guns. it will give a non-streaky, even blue-black finish to steel (except stainless). ships with 25 cotton swabs and backed by westlake market's quality product guarantee.