My current windshield frame has some pretty bad rot on the under side and small rust holes on the top. I scored a solid frame years ago, it only had one spot of surface rust on the lip under the seal(glass is out), but when you move it around you can hear rust flakes, a few even drop out from the bottom. So, I know it's rusting from the inside and want to slow or stop that as much as possible. I don't think filling the hollow channels would be a good solution, but maybe spraying either naval jelly or POR-15 in there might help? Anyone tried this or have any other suggestions? I'm getting to the point where I may actually paint it, put in some glass and install.