Originally Posted by TINCANBANDIT
you should never plug the bore on a gun that is going to be blued (with the hot salts method).
The solution is near 300 degrees and the plugged barrels will build up pressure and spew the caustic and very hot chemicals everywhere


For whatever quirk of geographic choice, most all of the outfits whose Hot Salts operations I pester, horse trade, finagle, and cajole into accessing are WELL above 4,000 FASL.

Quote
The solution is near 300 degrees


Low altitude temps there, and enviable.

The last outfit I used is just below 5,000

Up there we run over 400 * F.,....going through propane like there's no tomorrow, on a four tank setup.

The barrel sealing setup pictured / described above saw ZERO problems, through at least 6 bluing runs.

GTC


Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain