Leaking hard top- £4800 repair quote!

[Kondeeler]

My 17 year old E93 recently developed leaks at both C-pillars.
Did the usual - checked for blockages and Gummi-phedged it.
Still leaked, so tried plumbers silicone grease.
Small improvement.
Anyway needed to get my MOT- so I took it to a main BMW dealer and asked them to investigate
the leaks.
Passed MOT- no advisories, but they reckon the rear and middle rubber seals are past it.
The repair quote is over £4800! The two rubber seals come in at over £2800.
Any suggestions?
PS I’ve had the car for 5 years and her indoors loves it.

[craigjm]

Where are you based? Cayman autos in Redhill will know how to sort it

[Kondeeler]

Thanks. Cambridge.
Had another go with silicone grease, this morning.
Been raining for last 3 hours.
So far no leak🙏