Roof seal

[Reg]

Hello all, I'm new here, I brought my Berlingo Mk2 2004 in Feb this year, and drove down to Catalonia where I live, I noticed there was a nocking sound coming from the front left side and found it was the anti-roll bar rubber was worn, so I changed them both and now it's a smooth ride, no more noise.! The thing I wanted to ask anyone here if they know is, the seal on the roof ( which has windows ) seams to be lumpy, and i can lift up ( only the edge ) of some of the seal, I can't see if water is getting in, Is there a special clue or sealant I can use, or do I have to replace the seal !? I'm very pleased with the car as it's the first Berlingo I've had. Many thanks