The plastic strips for roof racks took the gel is that this is a safe place, but the agent was washed away again with the next rain. But that is the fault of the smooth Konststoffes because all other parts which I treated thus remained 2 weeks (including some rainy days) as black. The effect can be with regular use would also extend, possibly can after applying another sealer or wax above apply, so that it lasts longer.
Update 28/03/2012:
After spring cleaning, I wore this time on 2 layers thereof (in the shade).
Waschen-> Dry leave -> thinly - Leave for> 30min -> gently wipe -> thinly - Leave for> 30min -> wipe gently.
The parts looked really super. But not even 48 hours later, everything was gray and stained. The car was driven only 50km and was mostly in the shade. Rained not have the time as well. The product was also stored in a cool and protected. Am currently very disappointed, therefore only 3 stars. Tell I would no longer there currently.
I then simply drübergewischt with a duster (so no big pre) and a different product once very very thinly (Surf City Garage black max), this already holds 5 days and still looks like on the first day. Let's see how long ...