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Rear windscreen - seal and rust issues

Meeting room
carlmt
Snr Member
Posts: 889
Joined: Sat Jan 02, 2016 11:44 am
Location: Redditch, Worcestershire

Re: Rear windscreen - seal and rust issues

Postby carlmt » Mon Jan 14, 2019 9:46 pm

Fill the grommet holes with clear silicone and then screw the plastic panel back on using stainless steel screws.

The silicone will dry around the screw thread and seal the hole so that water will find it difficult to enter. The screws can easily be removed again - and this is what I do every time I clean the car : I remove the plastic trims, clean all the paintwork, give it a good coat of wax and then re-fit the plastic panels....every time now.... The rust will not have time to form!!!

C 8-)
1990 Daimler 4.0 638778
First registered 01.01.1991
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Erik
Posts: 27
Joined: Wed Dec 12, 2018 2:49 pm

Re: Rear windscreen - seal and rust issues

Postby Erik » Wed Jan 16, 2019 7:55 am

naki_k wrote:This is what you want to try and avoid!


Wow Naki that's a LOT of rust ... Curious to hear if you managed to sort it out, as I'm sure you did. Luckily mine is not as bad as that, but there are clearly some signs of rust and I'm dreading what I'll find once the windscreen's off ... Thanks for the info about those grommets, I will fill them with transparent silicone and just leave that black plastic cover off.
1987 3.6l Sovereign Solent Blue
1959 MGA 1500 Coupe

Erik
Posts: 27
Joined: Wed Dec 12, 2018 2:49 pm

Re: Rear windscreen - seal and rust issues

Postby Erik » Wed Jan 16, 2019 7:58 am

carlmt wrote:Fill the grommet holes with clear silicone and then screw the plastic panel back on using stainless steel screws.

The silicone will dry around the screw thread and seal the hole so that water will find it difficult to enter. The screws can easily be removed again - and this is what I do every time I clean the car : I remove the plastic trims, clean all the paintwork, give it a good coat of wax and then re-fit the plastic panels....every time now.... The rust will not have time to form!!!

C 8-)


Hi Carl that's good advice and a good approach. But did you notice that once it rains, water remains trapped under the black plastic cover a long time (at least for most of the year)? I've decided to fill the grommets with transparent silicone and just leave the plastic cover off. Cheers /Erik
1987 3.6l Sovereign Solent Blue
1959 MGA 1500 Coupe

Brake buster
Snr Member
Posts: 686
Joined: Sun Jul 03, 2016 8:18 pm
Location: Gloucester UK

Re: Rear windscreen - seal and rust issues

Postby Brake buster » Wed Jan 16, 2019 8:13 am

Erik wrote:
carlmt wrote:Fill the grommet holes with clear silicone and then screw the plastic panel back on using stainless steel screws.

The silicone will dry around the screw thread and seal the hole so that water will find it difficult to enter. The screws can easily be removed again - and this is what I do every time I clean the car : I remove the plastic trims, clean all the paintwork, give it a good coat of wax and then re-fit the plastic panels....every time now.... The rust will not have time to form!!!

C 8-)


Hi Carl that's good advice and a good approach. But did you notice that once it rains, water remains trapped under the black plastic cover a long time (at least for most of the year)? I've decided to fill the grommets with transparent silicone and just leave the plastic cover off. Cheers /Erik



i think its a bit of an over reaction to the possibility of rust, as the car is 32 years old and has not rusted in that place so far , so some simple preventative steps and put it back to normal

the key to drying off a car is ventilation, no matter the temperature, if garaged then ensure good mechanical forced ventilation to ensure an airflow around the vehicle to dissipate moisture , where possible leave the windows slightly open to aid ventilating the interior ,

my advice is remove the rear window trim , remove the outer rubber filler , and inspect the screen surround,

BB
1994 3.2S in Morocco red and Doeskin/Ruby red interior
1989 V12 XJS White with Mulberry interior
2015 XF Sportbrake Luxury 2.2D Turbo in British Racing Green Metallic

naki_k
Super Moderator
Posts: 28672
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Rear windscreen - seal and rust issues

Postby naki_k » Wed Jan 16, 2019 11:00 am

Erik wrote:
naki_k wrote:This is what you want to try and avoid!


Wow Naki that's a LOT of rust ... Curious to hear if you managed to sort it out, as I'm sure you did. Luckily mine is not as bad as that, but there are clearly some signs of rust and I'm dreading what I'll find once the windscreen's off ... Thanks for the info about those grommets, I will fill them with transparent silicone and just leave that black plastic cover off.

That’s a Spares car. Too far gone/ the rest of the car is just as bad.
Yours won’t be that bad, but it’s important to know what can happen when issues are hidden/ left unchecked.
88 3.6 XJ6 PDH/CEM
90 Range Rover Vogue SE 3.9 V8 LPG
91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
93 3.2s - 4.0 Manual conv
93 4.0 Sovereign
93 6.0 XJ81 DD6 x2
93 6.0 XJ81 XJ12
94 4.0 XJR
94 4.0 Daimler
96 4.0 X306 XJR
96 4.0 X300 D6
97 4.0 X300 Sport Manual
2000 LR Discovery ES TD5 A
Breaking 40/ 300