n ́gude, I used to get a disc seal from NIGRIN yesterday, because I can’t really see anything through the rear window in case of rain. the product is called NanoTec and is actually intended for the front window. Nigrin promises a bead effect for 24 months or a running power of 50,000km. with this set are included: 2 x cleaning sponges 1 x cleaning paste 1 x sealing cloth first cleans the intended surface with the supplied cleaning paste. If you use the light sponge and a lot of clean water to remove all the residues thoroughly, then dry everything well with a paper towel/cotton.You should take care that there is no rest of the cleaning paste on the disk. next, you take the sealing cloth and polish the dry surface until it is clear and If there is a streak, you can polish it away with a paper towel. in case you use this product on the front of the windshield, it is recommended to wipe the wipers thoroughly with it. do not apply in closed rooms or in the impact sun! and now the most important thing: in the dry phase of about 2 hours, the treated surface must not be brought into contact with water. as already mentioned above, the durability should be maintained for 24 months. or 50,000km. cost the whole about 10€ what I personally find somewhat overlaid for what you think in your hands,but if it really keeps what it promises this price is justified and I will think about treating all the windows and outside mirrors on the vehicle. tomorrow I will test this product on my vehicle and deliver a report about it in the course of the next week. I personally face this matter a bit critical as the word “NANO” f almost everyone nowadays has in his products and swears that his is the best.trend and so… comentare are desired() a nice day wishes you jujubean