SKB and I agree in thought.
Also there are ordinary gunmakers and there are highest quality gunmakers. Same with craftsmen who lay ribs. Tining the entire barrel surface between the ribs with solder, then washing and cleaning away all flux (if you use acid core solder for this tining) leaves a surface ready for laying the ribs. This surface between the ribs will prevent rust from starting--of course one must lay the ribs with rosin as flux.
By-the-way, as mentioned by SKB the Holland video is a must have for side x side and OU gun people.
Bv