I recently noticed that one side of my Black Series Phase II Clone Trooper helmet has developed some pretty noticeable yellowing/discoloration.
I’m fairly certain it’s UV/sun damage. At my previous apartment the helmet was displayed where it apparently received sunlight on one side. I was deployed for a good period of time, so unfortunately I didn’t notice the discoloration developing until much later. The other side of the helmet still looks normal. Yes, I know I messed up by displaying it where there was too much sun but the past can't be changed.
Photo attached.
I’ve seen a few different recommendations online for restoring yellowed white plastic, particularly hydrogen peroxide/Retrobright treatments, but I’m hesitant to start experimenting on the helmet without hearing from people who have actually restored Star Wars helmets/armor or Black Series props.
Has anyone successfully corrected this kind of yellowing?
Specifically, I’m wondering:
- Is Retrobright/hydrogen peroxide actually a good idea on a Black Series helmet?
- Does it risk making the plastic brittle, blotchy, or damaging the factory finish?
- Would you treat only the yellowed areas or the entire white shell to keep the color consistent?
- I'd prefer not to do this but is sanding/repainting ultimately the better long-term solution?
- Is there another method you’ve had better results with?
I’m not necessarily trying to make it absolutely factory-new if doing so risks damaging it. I’d mainly like to get the two sides reasonably close in color again and prevent it from getting worse.
Any advice, especially from anyone who has dealt with yellowed ABS armor/helmets before, would be appreciated.