Supplies Enamel Paint?

I haven't used enamel paint on resin, myself. However, I have used the acrylic kind enamel paint on model kits, while you'd want the paint to be as permanent as possible for scale models, without any fear that the paint won't come off ever (you actually do want it to be as permanent as possible, when it comes to models). You can remove acrylic enamel paint, as it's water based.

Most of the popular enamel paints are oil based, so if you don't want the paint to be a huge pain in the lower back, to remove, then make sure it is the acrylic type. It should be easier to remove. You still need to prime/seal the resin, for the paint to stick to it, and be easier to remove without possible staining later on. Hope that helps, good luck.(:


Edit to add: you can always test the paint on a small area like inside the head cap. Prime the surface, use the paint, wait for a few days then remove it as you'd remove a face up. There should be no issues, but it's always best to test things before hand, if you can. More so if you don't want to make it truly permanent. (:

 

I have personally only used the brush-on kind, on very small, (non-resin) scaled auto/car and Gundam models. So, I can't say the spray-on ones work the same. I would imagine they are easier to apply, but I'm not sure they wouldn't be safe on resin or would be safe if you're going for a not so permanent paint-job (due to possible permanent staining). Having said that, I haven't try removing the enamel paint from those models, so who knows. It's best to always test on small areas, if you're unsure. That goes for any hobby and trying out a new (for the genre) tool or material.

Most people who use enamel paints, don't really go for a temporary type of paint job -- usually on other customizable type of toys. However, these types of dolls call for constant refreshing most of the time, while some might not really want that. It might be something that worries most (the staining part). MSC was always meant for scaled models after all and not meant to be removed at all, so you never know. Spray-on acrylic enamel paint might be something you can remove. You can always try it out, if you wish to do so, or even use a spare junk part or a practice head. Hope that helps, and good luck! (:

 

You can get acrylic paints that are metallic. Acrylics will still be thick enough to make it look like metal, and they will be just as hard as enamel. The good thing about the acrylics is you can soak it off with water if you ever change your mind, or mess up while painting the doll. Enamel would have a good chance of permanently staining your doll.

 

My Robotica X-NANA is waiting patiently for me to get my airbrush hood assembled so I can try out Vallejo's acrylic metallic paints - but I agree that you can get metallic acrylic paints in non-airbrush form too.
This YouTube video convinced me to buy the paint. He did a test on the various paints on plastic spoons, and I like the finish.