Okay, I guess I have to weigh in here a bit.
Eddie- Thank you for the kind words but actually I did not get to FWS. Was based at Nellis, flew with them a lot, went to all the academics, but did not formally attend. I have great respect for you, and those who did. It is, as you say, the PHD in fighters. Being a patch wearer was, and I'm sure still is, quite an honor. No Yahoos there. Congratulations to you. Well done.
Yes I did experiment with mixing two systems. That does carry risk. I was just talking to DW about this and I told him I would do it again. But you can only mix systems if you are experimental. You can NOT do that with a certified build. But lets talk about why this may have gotten a little testy.
The fabric and paint job on a Cub represents a HUGE amount of time, labor and money. It is also extremely high profile. That is what everyone sees and that is a large part of how they rate your craftsmanship. If you make a mistake and make a mess of the instrument panel, it does not cost much in dollars or time to get, and cut another one. Mess up the fabric on a wing and you can be looking at up to 100 hours of labor and an easy 1000 bucks in material. Get the whole job done and don't like it, or it does not last, or develops paint bubbles, blisters, etc and now (for an amateur) you may be looking at 6 months and 5 grand.(up to 9K for Oratex) THAT IS AN EXPENSIVE FAILURE. Not just in dollars but also TIME. So there is a great deal of stress with the covering and paint.
Now I'm going to ruffle some feathers. I don't know if I have ever heard of a Stitts disaster. IE the paint bubbled, or curdled, etc. Follow the directions and you are just about guaranteed a great cover job that will last 30 years. Has lots of nasty chemicals but IT WORKS. The chances of you having to redo huge chunks at great cost of both time and money is VERY low.
Stewarts - Lots of full blown "failures." Paint adhesion issues, blistering, color match etc. Many "failures" did not show up until a few months after completion so resulted in full recover jobs. That is MASSIVELY discouraging and expensive in time and money. For an amateur that airplane could easily be out of service for a year. Stewarts has gotten better and massive failures are getting less frequent but it still represents a risk to the builder.
AirTec - The system rarely "fails" but it is easy to get it on thick such that the finish develops cracking, ringworm, and perhaps some adhesion issues. If you put it on thin you run the risk of pin holes (see my thread) but it seems to be pretty good other than that.
Oratex - Still relatively new, thus still having issues. From my perspective, there are three issues. 1) Tapes - as discussed in this thread, 2) Overall appearance - if you decide you do not care for it when you are done - you have to recover the whole airplane, 3) And finally cost. I have no doubt a great deal of Greg's stress stems from the feeling of looking at the possibility of a complete re-cover job. That would stress anyone out.
The covering process is a HUGE investment in time and money. How much are you willing to gamble on a "failure".
Every system can point out their success stories and every system has won awards at Oshkosh. But how often do you hear of a failure? Is it just a small problem, that you can live with, or is it a full blown disaster? We all want to think we are smarter than everyone else thus the disaster would never happen to us, but I can assure you some of the total disasters with Stewarts, during their teething period, were folks that were outstanding craftsmen.
There is nothing during a build that has the same consequence as fabric issues.
I am not recommending one system over any other, just know your risk and reward, when you make your system choice.
Bill