how to re blue the barrel

hey got an 303 longbranch looking to restore myself for first time but finding it a mission to find a kit or spray of evan just instructions on re blueing all i can find is stuff in a america any help would be much appreciated cheers

Birchwood casey do a paste and liquid, best get the set of 3 products, you can buy them from most gun shops...
Search you tube, as some good vids there as well..
or just get it black ceracoated.
https://www.birchwoodcasey.com/Refin...Finishing.aspx

I think the sets are about $35 or so, definitely less than $40.