When I had mine off to do the chain and rails (what a nightmare especially with the motor in the car) I used a german sealant called Dirko (sp) to seal the pan. I have used this product alot when doing repairs on my 911. Works great and cleans up easily. You could also probably use the MB sealant that is recommended for the front chain cover. Personally I do not know if it is recommended or not but I would shot myself in the head if I had to pull that pan again due to a leak.

Have fun!!!!!

Tinker