To make you feel better, the 123 has the same channel for the trunk gasket.
Yeah, it`s probably not the best design in the world,
then look at how old these cars are, not exactly spring chickens.
we buy a car that has alot of things neglected over the yrs, and then we
come along to put back in working order.
Just think how boaring life would be with a new car, nothing to do

.
I was looking through my literature on POR products I have bought. I get a
sheet with ea product on how to use it. the only one that says anything
about temp, is metal ready. "metal Ready will work more efficiently when
used in a temperature range between 65 & 90 deg. Fahrenheit."
With the Marine Clean-- "A hot solution will work better and faster. so
dilute with hot water and store Marine Clean indoors."
That is about it on temperature.
Too bad our temp is so cold there, not fun to work in.
If you can`t get it done in time before the rains, there is always Duct Tape

.
Charlie