waterproofing

I read that water repellent products seal the leather's pores. Since the leather's pores are closed it can not breathe and will cause dry rot. This was said by Gail on the Schott forum. If I'm going to buy a leather conditioner should I avoid products that say waterproof, weatherproof, water...

scotchgard on a felt hat? Is that an ok thing to do? I'd rather be ina dry hat than a soaking wet hat. Is there any reason not to scotchgard a hat? I noted that in the tilley instructions they say to scotchgard their hats every now and again

This seems to work on other sites, so I figure that it deserves a shot here. If you've got a quick hat question and don't see a thread for it, just post it here. Whether the question is about cleaning, anatomy of a hat, brands, etc., this is the place. Here's one to break the ice.