Misting my casings.

I read that you shouldn't mist your cakes directly and you should have a piece of plexi glass in the chamber preventing the water from hitting it directly. Why can't you spray it directly. I don't have any plexi glass so is there a way to mist it safely?

Thanks.

just try to avoid getting droplets on the cake.
the small droplets are the problem, they stay there, not evaporating much since humidity is high, they become stagnant [losing all dissolved O2] and smother the underlying tissue as well as providing a breeding ground for bacteria.
so daub up any droplets you spot on the cakes with a clean paper towel asap.
sprinkle a bit of verm on the cake surface to soak up water

btw,
i'm a bit puzzled,
you say cakes
but thread title says casings,
which is it ?

Just a typo. I meant casings. Thanks for your reply.