This is a paid asset, but now you can download Wet Stuff Free.
Detail this asset from Unity Asset Store: Original Link
Wet Stuff v4.1.2 (Latest version)
Wet Stuff v4.1.1
Wet Stuff v4.0.0
“If possible, please buy the package to support the developer”
Wet Stuff makes it easy to instantly make any surface appear wet; simply place decals into the scene and surfaces within will appear wet. Decals can be configured with a powerful set of tools and animated using timeline to simulate many effects such as water buildup, puddles drying out, slightly damp surfaces and more – all without modifying any textures, materials or shaders.
* Instantly make any surface appear wet
* Easy to use decal system
* VR Support
* Create wet surfaces at runtime
* Automatically creates splashes from particles systems
* Powerful configuration system to create a range of effects such as:
** Rain splatters
** Puddles growing and drying over time
** Leaking Pipes
* Enviro Integration
* Unistorm Integration
Wet Stuff requires cameras using `Rendering Path: Deferred`. If you’re interested in using Wet Stuff with the new HDRP pipeline please contact us.