I have dyed 2 PS90's for friends and my own gun as well, it was very easy with better than pro results! :shock: The prep is everything, degrease with hot soapy water followed by an alcohol bath then drop it "the stock" in the dye for 4 hours turning every hour. Do add the green dye to avoid the purple hue with the 4 bottles of black dye to boiling water "about 180 degrees" in the cooler and keep the cooler lid shut! 8) I only put in enough water and all of the dye to cover the gun because I added more boiling water half way through to keep the temp up as well. When the time is up rinse the stock off with soapy water and then WD40 to displace the water, then wipe down the stock with lots of paper towels and you are done! One more thing, wear rubber gloves the black dont come off your hands, it wears off! If you have a large turkey cooker that works well too, just degrease!!! Directions on "how to" are on this forum so check it out, if you feel your results are sub standard you are only out $10-15 bucks and you can still send your stock to a pro. As for the cooler you dyed black it still has a great use, no one wants beer out of the ichy black cooler " they think its mold " he he he...... :?