[Turn and folding her arms. She can't help but get annoyed at Winry's behalf, even if the other girl doesn't need it. Besides, she's not having luck with that tray]

Moron - aren't you a scientist? If she changed the composition to make it lighter it would probably then rust faster. The way it's installed you're practically a breeding ground for tetanus anyway.

[Of course, she's guessing. She's only got a high school level mastery on these things]