stainless weld backing tape?

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I've got a couple of jobs coming up where I'll be joining some stainless pipe, 2-4" ID.  I've got a short backcap for my tig torch and intend to weld both inside and outside, but need something to keep the side opposite the one I'm welding from coming in contact with atmosphere and bubbling up.I see that Arc-Zone has a bit of variety of tapes and I need some input from someone who has done this before...Water soluble?  Adhesive free?  Whats the best option for what I'm doing?If it matters I don't think I have full access to inside and outside and will be welding on the bench.  Welds are being done <1.5" from pipe end, they are being fitted with a tri-clamp fitting on the end, I am fairly sure if I had to I could just wire-wrap the exterior of the pipe where the two pieces are getting welded over the tape, or stuff the interior and bend up some tig rod to hold it in place.
Reply:Where is FieldRes when we need him?30+ yrs Army Infantry & Field Artillery, 25 yrs agoMiller 350LX Tig Runner TA 210, spool gunLincoln 250/250 IdealArcESAB PCM 500i PlasmaKazoo 30"  vert BSKazoo 9x16 horiz BSClausing 12x24 lathe20T Air Press
Reply:What about using Solar flux?Mike
Reply:Originally Posted by leightrepairsWhat about using Solar flux?Mike
Reply:Purge the inside and use a purge block on the outside? Why are you welding from inside and outside?Airco Ac/Dc 300 HeliwelderMillerMatic 200 (stolen)Miller Maxstar 150STLMiller AEAD200LE (welding and generating power) Hobart MIG
Reply:I'd use solar flux on the inside and weld it all from the outside.JasonLincoln Idealarc 250 stick/tigThermal Dynamics Cutmaster 52Miller Bobcat 250Torchmate CNC tableThermal Arc Hefty 2Ironworkers Local 720