Hot bluing from cold bluing

Anyone ever try to cold blue a gun or receiver even with the paste and it comes out thin with stripes no matter how many coats.i have a cure and it makes it dark.i take a aluminum cup a heavy one from like the bottom of a canteen i pour the bluing in there all be it paste or regular with a non napth rag or swab without lint.this is for caution as bluing is mostly acid.i open the garage door and take a propane torch and put it on the cup not breathing the chemicals i already have gun degreased and ready to go.i get the bluing just about to the boiling point but it cools fast.i take the blued soaked rag out of the aluminum cup and wipe it down the length of the barrel the hot bluing turns almost black and bites right into the metal.let dry for 15 minutes or so re heat the cup and do it again and when you are done to you color of bluing desired wipe it down with oil and put it away without touching the metal.i refinished alot of customers firearms that way,as metal is porus and when you heat the rag and rub it down it changes the molecular structure of the metal to open up and literally soak up the bluing into the metal.it works 100% of the time.i guarentee it.an old body mans trick but for other solvents you will not be dissapointed.if your barrel is super rusted run the barrel up and down a grinding wheels wire side and take off all the finish and all the pits then go over it with steel wool in the correct orders to you get 4 ot and degrease then instead of cold bluing just running off as it always does it bites right into the metal not one streak or splotchy area.