Because Color3 tint not working on textures: Clone texture and flip it for Decal

Hello!
Because textures do not use Color3 to get tinted but decals do (If you know how to make color3 tint on textures, let me know…), I have to use decals for my projects.
But decals textures flip direction if you put them on the right or on the left face… So I would like to clone a texture by code, flip it and assign it to a decal but I haven’t been able to make this work either.
Does anyone know how to do this? (I need decals and not Gui because there are bones on the model)
Thank you!