Shin etsu grease might help a little. I've got a pretty big tube of it. I'll try to get it to you sometime this weekend.

Shin etsu works great for small leaks. I haven't had any problems with the soft top on my AP2, but had some minor leaks on my AP1. A good rubbing of shin etsu took care of it. All it does is make the rubber swell a little, and gets rid of any dry spots where water can be slipping by.