Not only dangerous, but being in a welding environment it would be filthy as soon as you started grinding, sanding, etc.. I used a hightemp, ceramic based engine clear-coat over a diluted gun bluing finish on my recent workbench project, and it seems like it will hold up well. Mike
I would be interested to know the brand of gun bluing finish, how much you dilute it, & may I assume that the aforementioned clear-coat is rattle can?