I am using TUFO tubulars (S22 pro) on my road bike. To be puncture resistant I use Tufo sealant "milk" in them. It works well, I don't remember when was my last flat.
When I go out for ride I pick up a spare tubular (Schwalbe Montello) into my pocket and a mini pump. When I get a flat I replace the flatted one with the spare one, without gluing. In this case I have to be a little bit carefully at the corners.
Some years ago I tried several brands of tubulars, Schwalbe (Milano, Montello), Vittoria Rally, and some Italian ones. So far the Tufo is the best, and the most flat-resistant. The Schwalbe was the worst, the small gravels get in the mild rubber and caused several slow flats.
I repair my tubulars for myself, except for the Tufos all of them can be break up, and can be re-sewed. There was a trip with my friend in Slovakia where my spare tubular gets flat on the bike. I had to break up the flatted tubular, patch it, re-sew, and glue it up - on the pavement... At least my friend could relax a bit.