Solution for moisture collecting in the back window corners?

[DHawk]

My son and I recently cleaned and rebuilt portions of the window frame for the back glass on his 67 Cutlass Supreme. It was badly rusted in several areas like the lower side, the corners and along the bottom. We chose to use fiberglass cloth to restore missing portions. Thankfully, there was enough metal to hold the fiberglass for filling voids, but also enough to still have the molding clip studs present.

Now after laying the black sealant and replacing the glass, our first thought was to go around the edge of the back glass with silicone sealant. Not a good plan. The previous owner used gobs of silicone under the chrome molding and around the glass to try to hold the water out. He wasn't successful and just made our job harder in doing the repair. We decided that the space is so tight between glass edge and body, we would be doing the same messy job. So our decision was to let the black sealant do the job it's supposed to do and leave out the silicone.

My question to forum members is, have any of you done something in the lower corners of the back window to drain off rain and any other moisture that collects there, besides just drying through evaporation?

 

[307-5a]

This is a very common issue , water collects then creates rust under the window molding / then creates a rust hole / then the trunk gets moldy and rusted out as well .

One of my cars collects water in the back window , so i use a leaf blower to blow out the water after washing the car . Could also use compressed air if you have an air compressor . i have covered parking , so can keep the car dry .

Question do you have covered parking for this car ? if no and its not a daily driver then maybe a car cover would help .

If you do not have covered parking ,
i have seen a car with water drains installed , a small funnel shape with a short metal tube welded / attached at both lower corners / then a rubber hose attached to the short metal tube . Drill a hole some where in the trunk insert the rubber hose. down side is this takes up some trunk space as you do not want to bump this fragile arrangement . sounds like you have fibreglassed this area so , so might be easy to attach a funnel shape drain system .

 

[DHawk]

My son who lives in Corpus Christi, at some point will move the car there from dry west Texas. He mentioned using a blower or his air compressor, so glad to hear that works well. Your other suggestion of a car cover, we hadn't thought of. Glad you mentioned that as well.
The small drain with hose also sounds like a possible solution. Just a matter of finding the right components to funnel it off, maybe out through a hole above the wheel well. Yes, we had to use fiberglass reinforcement in the corners, so a small fitting nestled there could be easily installed seated on silicone glue base.
Thanks so much for your reply. Much food for thought!