First of all, great info Kat. Nicely done.
I've been wanting to do this for the last couple of years. Finally got tired of putting it off and got to it this afternoon. Like Submariner, I gave it a liberal app of the Gummipflege and let it soak in. Did the roof, doors, trunk--everything. Took me about 3 hours and will stay on top of it from here on.
Plan to do the lube tomorrow. Everything looks great and I feel better for having done it.