Rode 'sew ups' (tubulars) back in the 70s. Yes, patched my own (at home) when I got a flat. They were some of the few high pressure tires out at the time.
Sew ups will stay on the rim (air pressure only) and can be ridden/raced without any glue (Tubasti).
Had a friend who never glued his sew ups as the rims 'could look messy'. Did see him roll off a tire once during a sprint. Not pretty! Still, he continued 'glueless'.
With today's light/foldable and high pressure clinchers I have no need for sew ups.
But it is nice to reminisce . . .