Several questions: What kind of paint are you using to paint the metal grids of your suspended ceiling? What method of application are you using (airless spray, brush, etc.) What kind of paint are you using to paint the ceiling tiles of your suspended ceiling? What method of application are you using (airless spray, brush, etc.)? Please comment on any “do’s and “don’ts” that you experienced or learned. For anyone that has painted their ceiling tiles, did you paint both sides? Armstrong recommends doing this. FAQ from the Armstrong site: Can Armstrong ceilings be painted? Fiberglass panels should not be painted. All other Armstrong mineral fiber ceiling tiles, panels, planks, and even grid can be painted any color or to mimic any metal - bronze, tin, gold, or copper. Latex or water-based paints are recommended Install the ceiling material. Tiles and planks may be installed before or after painting. Using a paint roller with a 1/4" nap, apply two coats of paint, waiting 24 hours between coats. To achieve the look of green patina that develops on copper with age, use a small natural sponge to apply a stippling of dark green paint followed 24 hours later by a stippling of light green paint. Vary the placement of the paint and texture of the sponge to create an authentic look. Note-- For best results on 2' x 2' or 2' x 4' panels: If using a water - based paint, also paint the back side of the panels with one coat of paint and let dry before installing to prevent cupping. Painting Precaution: Armstrong cannot guarantee that the published surface burning characteristics, fire resistance ratings, acoustical performance, dimensional stability/sag, or light reflectance will remain the same after repainting. Field painting will void the ceiling's warranty. Will painting acoustical ceilings affect acoustic efficiency? Yes. Armstrong acoustical ceilings can be painted using no bridging or porous paint that does not cover the holes, but expect a slight loss of sound absorption.