Is there any software that actually simulates wet painting, like

>>59050475
No. Seems like you've just found a nice niche for a programming project, congrats. Best of luck to you, do a good job.

its actually a good idea if it exist

>>59050475
hope your team is fast in developing either you will be second ;^)

Corel Painter is the closest I think.

Corel painter has an engine for rudimentary simulation of paint mediums, up to settings of paper type affecting spread and drips. Still cluncky looking and slow for my tastes.

>>59051120
I think they fixed the speed in 2017.