Steve Flint said:

I have a leak on my 90 and I think it is from the rainwater channel, It leaks into the inside channel in the roof and as I go down hill water comes out of the roof and runs down the inside of the drivers door.
The mastic in the rainwater channel has fine crazing and so I spread some silicone sealant which stopped it for a time but then the silicone started to come away and it leaked again.
My question is, is there a good way of removing the old mastic and then replace it with {what }
Any suggestions,
Steve.

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Al2O3 said:

Silicone sealant never lasts long outdoors.
I would try rubbing down the channel with something like a small, brass wire brush. Get shot of all the silicone, then I would apply seam sealer down the channel using a spreader the width of the channel.

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mick the builder said:

Did you just copy and paste my reply? Lol

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Al2O3 said:

Ha, ha sorry Mick. Wasn't sure what you meant by panel sealant, so just described what I did to my roof You obviously call it panel sealant over there

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