The finish of my P11 started to fade after 8 years so I reblued it. When I bought the P3at a few weeks ago I couldn't help but notice how thin the bluing was. It showed wear after a few weeks of use and the bluing was uneven at best. I decided to reblue this one as well. I used Super Blue by Birchwood Casey. It is much stronger than Cold Blue and held up for 3 years on my P11. I have also used it on rifles and to touch up my XD. What you'll need Denatured Alcohol ($6 at Home Depot) Distilled White Vinegar ($1.50 at Walmart) Birchwood Casey Super Blue ($7.95 at gun shop) Paint Brush or cotton balls (you aren't painting you just need it to apply the solution) Steel Wool Steps: Field Strip the P3AT Remove the extractor screw and extractor. Remove firing pin and spring. Place the slide in Distilled Vinegar, making sure that it is completely covered. The vinegar will dissolve the finish 100% in about 5-10 minutes. After 10 minutes or so the slide will turn brown. Remove the slide from the vinegar and wipe down with a cloth Wash slide with denatured alcohol making sure to keep finger off of exposed surfaces or they will be contaminated with oil Now would be the time to do any grinding or polishing you may have in mind. Using a paint brush or a cotton ball, apply the Super Blue to the metal. It goes on clear and the metal turns black in a less than a second. Don't forget the inside of the slide as all of the bluing will have been removed there as well. You can wipe it down and apply more or just keep wetting it with the solution. Allow it to sit for a minute or so then rinse with warm water and dry with a towel. If it looks uneven you can sand it and reapply. Use as many coats as you want as it only affects the exposed metal. When finished, wash the slide with water and rinse with alcohol to get rid of any solution/water that may be remaining. Dry with a towel The outside of the barrel can be blued too if you want to get rid of any shine. I did this on my Pf9. Coat the slide with gun oil and let it sit for an hour or so Lightly rub the slide down with the oil soaked steel wool. Don't use much if any pressure as you are simply removing any contamination and lightly polishing the new finish. Clean and lube as normal and reassemble. If it looks too shiny or if you see strange color fluctuations, then the slide was still oily when you started. Easy to fix, just get some 600grit sandpaper and sand the slide down (Vinegar won't remove the new blued finish) enough to roughen it up some, clean with alcohol and repeat the bluing process.