Hi David,
My '66 Globetrotter and '68 Trade Wind both had small "leak points" at the hinge and the gasket areas. I cleaned off the old gasket glue with a
soft wire wheel and installed new gaskets from Vintage Trailer Supply (
Product Code: VTS-524 ) and that solved the leaks from the curved glass.
The key I found is to carefully "
tweak" the surface of the frame the gasket mounts to with a Wiss 3” Hand Seamer to a point where the glass contacts the gasket firmly when closed. With the gasket removed and the glass in the closed position it's easy to see the variations in the gap from the frame to the glass and adjust it to better match the glass.
I've noted too that as the glass is pulled in at the bottom by the Sill Latches they may have a tendency to add some bow to the glass and open up the seal gap in the middle of the curve.
I also insert the new gasket up under the hinged area to the top of the frame and let it be crushed by the "glass rail" part of the hinge holding the glass. This helped keep the water from tracking in behind and dripping down.
Note: The new gasket needs
regular applications of silicone spray to prevent it from sticking to the glass.
As for your drip rail idea I'm not sure how effective it would be to add more holes to prevent leaks. Unless you use an adhesive to hold the rails on.