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Latest on rear screen seal replacement

Chris

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We were discussing rear leaking screens on the 'who's doing what maintenance' thread recently and it was getting a bit hijacked so I thought I'd post my latest into a new thread.

I pulled the screen out of the green one and tried to clean it up. Not nice. I put it back in dry to begin with and so far it's never left the barn. So I can't tell you about that one. At the weekend I pulled the grey one onto the drive and took the screen out. Last time that was done was to have the tinting applied. The seal was in much better nick with only a couple of areas of mastic. Now, I have to say that given this lack of sealant, I'd have to say I believe that the factory didn't use goop. Just the magic of the seal. The grey one didn't leak nearly as badly as the green one and I figure I could clean this seal up to be better than the green one (are you following this) and put this into the green one as an upgrade. So what about the grey one. Well this is the interesting bit. I had a brand new seal on the shelf and I figured I'd fit that. Well, to describe it as being slightly tighter than the used ones would be an understatement. Flip, it was tight just getting it onto the glass! I really needed some Fairy Liquid on there. Again I should have used some lube to get it into the tailgate too. That was tight and a really nice snug fit. It's been raining the last two days and I went out today and opened the tailgate. Dry as a bone. No leak at all. Now I am not saying Hallelujah this is the cure but it would seem that a new seal works better than an old one. No kidding. I'd rather not glue the thing in but I will if I have to. I'll run it for a while and see what happens. If it's a good un then I might just buy another and stick it on the green one and be done.

Whilst in there I did find some early rust on the seam. I rubbed that down and killed it with Dinitrol, rubbed it again and gave it another dose. I filled with a bit of filler then primed and sprayed it over. I am no bodywork specialist so what I did was mask off the sill under the window leaving a 10mm gap then blended the mask into the vertical sides of the frame. I sprayed this gloss exterior black to finish it before fitting the glass back in. I wouldn't say I was delighted but which would you rather have. Rust or no rust and a bit of discrete rattle can. Pain can be done again, but once the rust has taken hold, tail gates go down hill rapidly and my inspection showed this to be otherwise very very solid throughout. Effectively this is a bit like adding eye-liner to the tailgate. Most people won't see it. I am going to get some vinyl pinstripe probably and put that over the top to mask how crap I am at this sort of thing.

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All sounds like good stuff there Chris, glad you've caught the dreaded tin worm before it's taken hold.

Good luck with a leak-free seal, all you need is a drop of rain to test it! :lol:
 
Sorry Chris I fell asleep somewhere during the second paragraph:sleeping-sleep:.... did you say you took something off that wasn't causing a problem then by doing so you created another one:thumbup:
 
I've never had issues with leaking screens front or rear. Only issue I've had has been breaking the front screen when fitting. I never use sealant and always use fairy when fitting. Maybe I've just been lucky regarding water coming in.
 
Ahh but you wear a hat Karl so you don't feel it dripping on your head. The new seal just feels very different to the 20 year old thing I took out. Yes there's a joke in there about 20 year olds, I'm sure.
 
When I use masking tape I leave the edge of the tape facing the new paint free with only the far side stuck to the panel. Then I fold the free side back on itself to form a tube so this does not leave a sharp edge. When I spray the panel there is a radiused air gap behind the tape. This gets filled with tapering thickness new paint getting thinner so by the time it reaches the tape it's only a fine mist if any. When I pull the tape off there is just a 1/2 inch wide misty line which can be polished out.
 
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Good old fashioned tip there Frank. Never had a drip from the rear screen but the front has been a nuisance. Leaked, had the seal replaced with a copy, it still leaked, had it removed and masticated...oooooer, never leaked but squeaked like hell, in particular on cold mornings the racket drove me nuts! Had a new OE seal put in with no mastic, no leaks and no squeaks until, the last month or so it has squeaked a little in the morning when cold, have to go with the 'no mastic' thoughts. Interesting my old Jaguar screen was fitted using a 'powdery' mastic if that makes sense. It came out of the gun almost dry, after a short while it 'semi dried' with a matt powdery texture, apparently sealed and prevented squeaks, worked ok.

regards

Dave
 
Got a crack in the front screen but no leaks Dave. But I also have a brand new OEM front seal too. If I change that screen, it would be nice to put it in with no gunge. Might ask my local screen place to do it for me with a screen from Karl. Fitting it's not the issue, it's fitting it professionally.
 
Interesting on the no mastic theory. The procedure in the FSM uses mastic. I still have a leaking rear seal after having the glass changed over 5 weeks ago by AW. Apparently they're still waiting for some sealer to be 'delivered' but I'm not giving up so easily. Crap service.
 
"Might ask the local screen place to do it for me"


Seriously?
 
Does it by jingo. Hmm, well as I said the pone I took out had barely a trace on it but in 20+ years TP who really knows the history. It might have been a week old, broken into and the local glass place didn't use sealer. But, they'd really have had to put a new seal in there as well or there'd be gunge. Maybe the FSM is written that way because it's a recognition that this won't be a new car on the assembly line under perfect conditions.

Anyway as you'll know just being up the road a bit, it's been wet all week. I'll have another look in the boot tomorrow and see if it's still dry. Usually even when stood, when I open the tail gate it runs in at the top left corner. Nothing so far.
 
Yes, why not. They're really good guys and independent so none of that oh we can't guarantee it, or oh we;ll have to invoice you plus vat blah blah. I can put a screen in I am sure done back ones now but there's some degree of expertise in getting it seated right and so on. Just figure with a new seal that it's best to get some help and advice on doing a top job. If it needs goop they'd do that in a heartbeat rather than me fudge about getting it all over my shirt. No shame in getting the professionals in. They did my tinting
 
Interesting on the no mastic theory. The procedure in the FSM uses mastic. I still have a leaking rear seal after having the glass changed over 5 weeks ago by AW. Apparently they're still waiting for some sealer to be 'delivered' but I'm not giving up so easily. Crap service.

That is interesting Towpack, I think the reason they never had the correct mastic in stock, is because newer vehicle screens are 'glued' in place. The older style mastic which never sets is rarely used these days.

regards

Dave
 
Perhaps you could order your own butyl screen sealer from eBay. It would be with you in 3 days or so.
 
I can't be very constructive on this issue, but my only experience has been no leaks at all and judging by the condition of the glass, I wouldn't be at all surprised if it's the original, never removed/replaced.

That was until I committed the truck to a re-spray 2 years ago, and they fetched out all of the glass.

On replacement, they used the 20 year old rubber but they did use a mastic sealant of some sort. I have no idea what it is, but it's black and after 2 years I can still make a dent in it with my thumbnail.

Whatever it is, I still have no leaks (or squeaks Dave) and fingers crossed, it will remain that way.
 
Hopefully that's what I bought in a canister last week. I have it on stand by but would rather not use it. When the front screen leaked on the silver off roader the same windscreen place went round the outer edge with that non setting stuff and cured it on the spot. I asked them to take the screen out and do a full re install. They said better to not take that chance as it could end in tears. Just seal it. They had all the right access kit and everything. I can barely reach the top of the screen on the grey one even on a ladder. I don't want a knee impression in the bonnet really.
 
That is interesting Towpack, I think the reason they never had the correct mastic in stock, is because newer vehicle screens are 'glued' in place. The older style mastic which never sets is rarely used these days.

regards



Dave

I think you're right on the newer vehicles having glued or bonded glass Dave but I find it hard to believe a professional setup like AW don't have easy access to the 'old' sealer. The fitter who installed the glass back in Dec left me an empty tube so I could get some and have a go at sealing it myself!
 
Perhaps you could order your own butyl screen sealer from eBay. It would be with you in 3 days or so.

You're right SC and I thought of doing just that and removing/fitting it myself but then thought f*ck it, I've paid for fitting and I'd like it done right.

I think Chris is definitely onto something with a new sealing strip. A new, soft, pliable rubber seal that is a tighter fit to start with has to be better than a years old (17 in my case) item that's lost some elasticity although it did seem quite pliable when it was removed.
 
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Never had this trouble years ago with screen leaks. The rubber came with a separate fillet. You put the main rubber then glass in first with no string nor struggle. Then you ran the fillet in which was larger than the gap it went into and this swelled the rubber up which sealed the screen. The rubber was very soft.

WD 40 cured my leaking screen recently. I guess oil in a syringe and pipe might be a cleaner way. Once the oil is in the crack the water can't get in.
 
Wax polish has worked for me in the past, something to maintain a surface tension on the contact faces to counter "creep".
 
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