Anti-parkour paint.

[ERH+]

I know oil flasks are not highly regarded in T3, as they introduce slapstick animations for AI, but this kind of access denial means could add interesting challenge if you can slip from some ledges and pipes.

https://www.youtube.com/watch?v=b7D_X7CTlm8

Slippery surface is already available, but probably used only in frozen areas. Using special slippery paint make it easy for colour coding, like in e.g. Mirrors Edge, but red colour in this case should be repelling.

Also it will raise suspicion with otherwise neutral guards if you are literally marked as a trespasser - reminds me of a police paintball ammo with hard to wash ink, so they can catch hooligans or cars later.

Edited June 19, 2023 by ERH+

[jaxa]

Have slippery ice surfaces ever been used in a TDM mission? I can't remember encountering it. I only vaguely remember encountering that in some T1/T2 fan missions.

[ERH+]

I had one in walk-in freezer in Marsh of Rahena, also some parts of roof made player unexpectedly slip down.

[thebigh]

I seem to recall the frozen little stream in Mandrasola was slippery too, but perhaps I'm misremembering.

[datiswous]

3 hours ago, thebigh said:

I seem to recall the frozen little stream in Mandrasola was slippery too

That is correct. I played it quite recently (making subs for it).

[Melchior]

A few missions had Icy surfaces, that had poor friction.

As for Guard/Watch issued "Paintball" markers - while technologically possible, I doubt they would bother - they don't typically use "non-lethal" options. E.g. Why mark a Brigand when you can spear 'em with a Crossbow bolt?