It is amazing how little a hole it takes to let a lot of water into trunk.

Guderian got a trunk full of water every time it rained. I finally found a dime sized rust hole near the bottom of the rear window. A fingernail sized portion was visible outside the gasket. I dug out the dirt and rust from under the gasket and filled in the hole with 3M window sealant.

Problem solved.

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1983 300SD "Guderian"
1987 MR2
2015 Camry
2015 Chevy Spark
2006 Hyundai Tucson