Hey guys I've been building gunplas for a very long time and to be honest I probably have more than 15 models at this point. I recently purchased 7 new 1/100 scale models since I finally had the opportunity to go to Japan, but this time I want to actually build them properly and read up on sanding. Before I only sanded on a high abrasian sandpaper, meaning I scratched the heck out of my gundams and didn't know any better

.
Anyways I've read that there are 3 basic levels of sandpaper that can be used to make nubs practically nonexistent, but I know from experience that this method will likely destroy my new Phenex model. Do any of you guys have some advices on how to handle models with a shiny or transparent paint?
PS: I would love to share a photo of my models and new purchases with you guys as soon as I get back to my home country