Glossy reflection only outside pollys ?

I’ve tried searching and not found an answer, also sorry if this has been answered before.

Trying to create a mat that’s reflections are only on the outside ? Material is as follows …

For changing front/backside behaviour, you should use the Geometry>>Backfacing. It will output 1 when the face is hitted on the backside, so in your setup, if you subtract that value from 1, and multiply the result with the LayerWeight value before plugging it into the MixShader, it will block the glossy shader to be executed on backfaces.

Thanks, will give it a try.