I've used a foam brush for the repeated application of krytox on two EOS cars now. I have found that the "cats tongue" texture of the seals seems to break the foam apart as it is used. I'll bet that is why they are saying "don't use foam brushes" because if you aren't watching, bits of the brush could get stuck to the seal and cause leaks.
When my brush is showing signs of wear, I use another brush. Usually, I'll go through a couple brushes for a single application on one car. The brushes are so cheap that I don't care if I have to use two or more.
As for krytox being bad for skin... not true. The reason I say this? Simple:
Krytox is actually graded as a "food safe" product. That means that it is used to lubricate machines that process food for human consumption. The lubricant has to be food safe as it may come into contact with the food being processed by the machines. Apparently, don't ask me how they test this, but if you accidentally ingest small amounts of krytox, they say that it is no big deal. If you can eat it, you can surely wear it.
Actually, and this is not a scientific statement, but I'd bet that it is better than some of the chemicals that we deliberately put on our skin.
From the dupont site: (reproduced without permission)
In the food processing industry, you don't have to sacrifice safety for performance.
- Chemically, biologically and environmentally inert and silicone-free.
- Completely clear, odorless and tasteless oils. White, odorless, and tasteless greases
From the Krytox Oil MSDS:
The compound is not likely to be hazardous by skin contact but cleansing the skin after use is advisable.
Drink water and do not induce vomiting. Physician advise is "activated charcoal may be used" which is, as I understand it, a "don't worry about it" message.
Overall though, don't believe anything I said. Do what makes you feel most comfortable and safe. If that is wearing gloves, then cool. If that is getting your dealer to put the stuff onto the car, good too.
The EOS is too much fun to be worried about things like this.