Tubular Glue Tape

BTW... if you're gonna run the tubs, then embrace them... use the mastik and skip the tape, it'll make you feel like an old world craftsman! 

I've been on tubulars for a few years, done tape, glue, and tape + glue (for Cyclocross).

I'd pass on tape for Tri's. It is very easy on a clean rim and new tire. It is a mess to clean off when you need to change the tire later. If you need to change the tire during a race forget tape, it will pull apart and leave bits of the foam material on the rim that your replacement tire will go over. Its also slower than a well glued tire.

You can take a used pre glued tire and put in on during a Tri and finish no problems. When you pressure up the tire the glue will activate and hold the tire on. I've changed a tire during an Ironman and Oly distance races. I find changing a tubular faster than an inner tube change when you put your mind to it.

When I put new tires on I stretch the tires for a day or two, put two layers of glue on the rim and two layers on the tire, put the tire on when the glue is dry, inflate and leave overnight before using. I've also used a syringe with warm glue in it to go around the edge of the rim and tire (put the glued tire on, inflate a little bit, roll the edge back put glue down, do this around both side, inflate to full pressure, wait till dry). This is something I'd do for racing Cyclocross or Crits, overkill for Tri's, you are not cornering enough to pull the tires away from the edge.

These days I use tubulars for Track racing because if they flat they don't roll off (I've seen some nasty Track crashes due to rolled front tires with clinchers). Only use them now a little bit for Tri's There are so many good clincher options out there now and it's easier to get race support via a new inner tube than sealing a tubular. I picked up a set of Flo wheels for my wife and will use those for Tri's when we are not both in the same race.

I do find that Tufo Extreme sealant to be the best at fixing a flat in a tubular. I spent a season training on tubulars and would never carry a spare, only sealant and a few CO2s. Fixed every flat I had. Same for races now, I just carry sealant and CO2s. For an IM I'll put an old pre glued tubular in my bike special needs bag just in case I have flatted earlier in the race and worried the sealant might not hold. I've never had any luck with Vittoria sealant or Hutchinson's version.