Just leave it for a day... Was expeeting wind shift from south but not that strong as it turned straight to the bow which was held by only one mooring line. And then the transom had a long french kiss with pontoon. Luckily neighbours noticed "jumped out" fender and did adjust the situation but the damage was already done.
This was my first serious try and I will admit it was not perfect. And I had to sand a bit more and to apply more coats of gelcoat. Main thing is to keep it waterproof :)