I have caulked the sides and sight windows on my Texas Hunter feeder. The damn things leak.
The feed clumped up, got down to the spin feeder, and jammed the spinner plate. That caused the motor to burn up. No warranty on “my negligence”. Not real impressed with them.
and here I've had mine on the pond for 6-7 years without any moisture issues.
I replaced all the windows/gaskets in the one that I bought from Fireishot and I haven't had any water issues with that one now either.