Immediately after applying it with a sponge, you can see how the yellow coating disappears and the boat becomes white again. Let it work for a short time and then rinse with a garden hose and neutralize again with neutral soap, etc. (Especially the galvanized trailer otherwise there may be rust stains) Perfect result and great product! Very economical!
Top product. I freed the entire lower ship (about 5m length) from the yellow. The gel is very easy to apply. After a short exposure time, the GRP is white again. Used it for winter storage. I am very pleased. Therefore use other products from Yachticon as well.
Has worked for me with a variety of yellowing. Unfortunately, since I had to handle the entire 9m boat because it got sulfur stains from firecrackers, I needed a bottle and a half. Man has to apply the liquid in its concentrated form.