I have read the lengthy thread on WD-40 which I have been using to clean my pump.I have noticed tiny spots where it seems the bluing is coming off of the barrel.I have noticed this on another shotgun I have when getting Hoppes bore solvent on the barrel.I was wondering if anyone was familiar with PB Blaster and if it could be used to clean and protect firearms?I have a can in the garrage and was just wondering.I will probably switch to Remoil which I have used in the past but was just wondering about this product. Thanks PS.....Has anyone else had a problem with WD-40 and bluing.