Advice on finishing a 3D printed helmet?

[The-Strike]

So I purchased some 3D printed parts for a scout trooper helmet.  The helmet is going to be used for some unique "cosplay" sort of use, and will be subject to a certain degree of abuse, so I didn't want to shell out for a real nice, totally accurate replica.  However, I do want it to be finished out nicely.

 

Any tips on sanding and finishing of 3D printed material?  What products work best for getting that surface smooth and paintable?  Also, it didn't come with a visor.  Any advice on a good place to shop for one of those?  Thanks!

[f3tt4l1f3]

LOTS of filler primer and spot putty.  Plus wet sanding, wet sanding, wet sanding, and more wet sanding.

[The-Strike]

Thank you!  Will do!