Galactic Marine Shoulders Sanding Tips

[AmatureManga]

Hey everyone im working on Galactic Marine costume and i'm focusing on the shoulder plates right now. My shoulders have been fully resined and fiberglassed. And moving onto the bodyfiller step i found out that the resin i've been using Aqua Resin can actually be used as a Bondo substitute, and since Aqua Resin doesn't produce toxic fumes and i dont need respirator and can use it indoors decided to use it for the bodyfiller. The right shoulder came out pretty smooth already there are some low areas and holes that need to be fixed though. But the left shoulder is where the problem is as you can see below my left shoulder came out VERY jagged. So for sanding i think for the left shoulder i first need to sand those jagged areas whereas for the right shoulder i don't really need to do that as much since there's not alot of jagged edges on it. Not sure what grit to use for my power sander any ideas?

 

[Deetz]

I would recommend a power sander of sorts, rotary works well for me, and start with 100 - 150 grit paper to really get those lumps down. Progress up to 180 grit by hand, at this point you can start seeing where you might need to add some more filler for any low spots. Final smoothing before paint use 400 wet sand paper up to 600. Prime the shoulder bells and before painting wet sand again with 800 then 1000 up to 2000 for a nice finish. have fun sanding!