Response sent to me by Paul Fix, CEO of Classic tube, our supplier of fuel and brake lines.
"There are some people that are confusing our product with other suppliers.
The original Tinned Bundy Weld "TBW" tubing was originally manufactured by supplier Bundy Corporation, had a corrosion resistant coating called Terne coating. Unfortunately that top coating is no longer available because of a ruling outlawing the lead and tin dip process by the EPA almost 20 years ago. At the end of that time Bundy Corp. was moving that coating process to two of their other plants until finally the enforcement pushed them to comply. At that time Bundy Corp. had already switched to offering a few different aluminum rich coatings that was then the new OEM standard. Also at the time, without too much notice I was able to purchase a two year supply of tubing and started my investigation for an alternative.
In the end we were successful in sourcing our tubing (Made in the USA). It is SAE J 526 spec. and has a "galvanized" type top coating that simulates the Terne coating. You may also be interested in knowing the results of the ASTM B117 salt spray test was only 250 hours for the old Terne coating. Our tubing has passed at 3000 hours.
We do not use the Aluminized Tubing, Zinc Plated or the Off Shore tubing that the others manufacturers use. These have the finishes that people dislike."
The process Paul describes is basically the same as was used on fuel tanks. Were instead of the Terne coating Spectra Premium now uses Ni-terne coating which has nickel in place of the outlawed lead. However where as the ni-terne gas tanks have a shiny appearance rather than the original dull surface his "galvanized" coating has a more correct appearance especially when compared to his competition.
Regards,
Scott