Fade Distances in 3D Skybox

I may need to create an effect of a rocket launching at the end of a round. If I set fade distances on the rocket's prop_dynamic in the 3D skybox, how will these distances affect where the rockets is visible from in-game? I'd ideally want to have it fade out as it goes further up into the sky (as opposed to being killed at the top of it's path, which would look bad), but seeing as the 3D skybox is 1/16 scale and already a fair distance from the main map, would fade distances be fixed up for 3D skybox uses?

I don't know how it would distinguish between the two, unless the 3D skybox visleaf gets marked as such and this affects how the fade distances are calculated. I might do some testing to find out.