Hello I have to reseal at our caravan all dachluken. Now I have filled on the Keder rails already the screw holes with Sikaflex 221 to prevent that no water enters, because he gets anyway still completely new groin filler. Now I read however the Sikaflex 221 is not UV resistant. Does this now something because of the Keder rails ? And should I prefer to take something else for the roof hatches and the oven tube ? Thank you already for your answers