The silicone is pretty much harmless, so if you have any indications that the doors are beginning to stick again, feel free to reapply it. However, if you do it thoroughly the first time, you should be good until next year.
The silicone is pretty much harmless, so if you have any indications that the doors are beginning to stick again, feel free to reapply it. However, if you do it thoroughly the first time, you should be good until next year.