Hi Bill:

Before I took my windshield frame to the plater, I drilled some discrete holes through the frame channels  in locations that would eventually be covered by the windshield gasket. This would help promote drainage of the plating chemicals. I then instructed my plater to direct rinse solution through the inside channels after the plating cycle to remove as much as possible. After I got the frame back and dried the inside, I sloshed a POR 15 solution inside the channels to arrest any potential for rust. It's been done now for a number of years and I've had no problem.

Good luck,

A400 Guy