I opened up Fort Max the other day only to find he's starting to yellow
He hasn't been out in the sun or anything
all i can put it down to is maybe a hot room..
It's not that bad yet but against the styro it's noticeable..
The only way you're going to stop that from happening is to have it in a temperature controlled sealed vacuum in complete darkness. Even then that will only slow down the process. Sorry to be the bearer of bad news