How do you smoothen rubber?

To smoothen rubber, you can use fine sandpaper or a file to gently buff the surface, removing any imperfections. For a more polished finish, apply a rubber conditioner or silicone spray, which can enhance the surface texture and provide a protective layer. Additionally, heat can be applied cautiously using a heat gun to soften the rubber, allowing for easier smoothing. Always test on a small area first to avoid damage.