Paint & weather plastic walls from a Walthers kit so it looks like concrete; and add some optional graffiti.
Our patreon page: https://www.patreon.com/FosScaleModels
Links:
Army Painter Matte Varnish:
https://amzn.to/3ERjDEo
AK Interactive /Enamels:
Streaking Grime: https://amzn.to/3ERjDEo
Light Rust Wash: https://amzn.to/3t8dz7V
Crusted Rust Deposits: https://amzn.to/3rqVHEI
Dust & Deposits :https://amzn.to/3LxXONG
Decal Solution : https://amzn.to/456XNaL
Walthers Retaining Walls:
https://www.walthers.com/urban-underpass-retaining-walls