I tried the durablue 2-part aerosol can on a once distressed blued ruger security six and so not to let any leftover spray go to waste, I also had a 1917 that had been re-barreled with a 625-10 barrel.
After a thorough de-greasing followed by some 400 grit sandpaper on remaining blued finish and a final de-greasing, spray went on ok.
My advice from the lesson learned is don't rush the coverage (ruger needs blasted and redone). Spray lighter coats with adequate dry times in between and it should be ok.
As to the quality of the finish, if done properly, it can be an improvement but with my inexperienced abilities, I wasn't all that pleased but like I said, someone else could do a better job.
ETA:
I used the 400 grit to roughen up the metal and remaining finish before spraying and degreased using acetone.
If a run occurs, you might can touch up before the can hardens. It was several hours before the catalyst had set to the point it would no longer spray. I imagine cure times will vary with temp & humidity. Also, shake according to directions both before and after activating catalyst. I let mine air cure as I was told it will harden the same as oven dried but naturally takes longer (days) to fully cure. Unless your oven is big enough to suspend the parts, let it hang at least 24 hours before laying on anything so not to leave impressions in the finish.
Don't know how you're set up but I found spraying outside in full natural sunlight (under right weather conditions) worked best for me.
