Stainless exhaust - purge vs solar flux?

[spv]

I am currently fabricating a custom set of headers for my car. I have been thinking of duplicating my mild steel mockup in stainless. I have read about this paste called "Solar Flux" that one can paint on the inside of the tube prior to welding. Apparently this creates a good purge inside the tube that will pass X-ray tests (according to the manufacturer).

Any experience with this stuff? I also read of a novel idea of using masking tape on the inside, which apparently shields the weld (and burns off) as a poor mans purge.

Here is the site for the "Solar Flux": www.solarflux.com

 

[BD1]

I would think that by the time you buy it you would not use that much argon in purging. Argon purge is ALL we ever do . It is the acceptable practice in the industry.
If you try it let us know how it worked.

 

[BWS]

Have done the solar flux and will continue on certain pcs.,only because...for whatever reason?...it can't be plugged/purged.It works,just ok.

We have a bunch of taper'd steel plugs or bungs turned that get used for purging,works good and is pretty fast.I reckon you could even make them out of wood?

 

[t100]

or purge with Nitrogen.