Author Topic: Bonded Screen  (Read 13290 times)

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Offline bill

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Bonded Screen
« on: Wednesday,February 05, 2025, 08:58:51 AM »
I have purchased a new screen fitting kit from SJ, this includes Chrome strip and corner pieces, plus sealant. However looking at the workshop manual it shows another seal in between the body and glass and an inner seal.

I don’t understand, am I missing something - photos attached.

Any help would be greatly appreciated

Regards.

Bill



Offline 4129R

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Re: Bonded Screen
« Reply #1 on: Wednesday,February 05, 2025, 11:46:03 AM »
I have had 6 Europa screens fitted professionally.

First they clean the fibreglass surround and paint it with a black primer.

Then they clean the screen, as silicone used in making the screen makes adhesive not stick.

Then they fit the chrome surround and corner pieces and glue them to the screen.

Then they use a special mastic applicator which produces a V of black mastic which sticks to the primer on the fibreglass surround.

Then they carefully lower the screen into place, and hold it in the correct position with sticky tape.

Then leave the screen for 24 hours for the mastic to set.

Get it fitted professionally, or your screen will leak, damage your dashboard, and you will regret it.

Offline SwiftDB4

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Re: Bonded Screen
« Reply #2 on: Wednesday,February 05, 2025, 01:29:49 PM »
I would follow previous reply's advice. Urethane bonded windshield are a mess for DIY and fraught for errors.
The diagram you're referencing is before urethane when butyl strips were used. Butyl is outdated and inferior for windscreens.

Offline EuropaTC

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Re: Bonded Screen
« Reply #3 on: Thursday,February 06, 2025, 12:12:55 AM »
Hi Bill,

The previous posters are right, the manual refers to using thin butyl rubber strips as the adhesive and sealant, whereas most modern windscreens I've seen are using urethane adhesive from a mastic gun.

Do you need to get it done by a professional ? It's all down to you and how confident you are in doing the job. There is no doubt that a competent professional will make a quicker and better job of it than your average DIY guy but that's down to experience and not because they're rocket scientists or it's a magical secret. 

Your car, your call - IMO it comes down to how much you want to do yourself or if you like the challenge of learning new tasks, it's not about the relatively low cost of someone doing it for you.

Like a respray, it's all down to preparation. A sheet covering the dash/interior, carefully masking off areas where you don't want mastic to go, working slowly and not rushing the job. If you can do that, then there's no reason why you can't do it yourself.  The Europa has a relatively small screen compared to modern cars and isn't that difficult to do, the biggest problem is setting it down squarely for someone working alone.

Full disclosure, yes, I've fitted mine but when our modern camper needed a new screen I had it done professionally - twice in fact, that thing was a stone magnet.

The first Europa replacement was shortly after buying the car because those butyl strips were leaking (SwiftDB4 is right, they're not the best idea) and the second time was a new replacement because the laminations broke down. I'd stuck it in with adhesive, it was hard work removing and I ended up cracking the glass.  But neither time did it leak afterwards and that's from a period where the car sat outside in the Yorkshire winters, 24/7.   In fact when I resprayed the car in 2011 I decided not to remove the screen because it was definitely stuck in and I knew I'd crack it getting it out. It still doesn't leak although it does look scruffy around the edges now....   ;)

Brian
 

Offline bill

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Re: Bonded Screen
« Reply #4 on: Thursday,February 06, 2025, 02:17:19 AM »
Many thanks guys
Will get a professional to do it

Regards Bill

Offline BDA

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Re: Bonded Screen
« Reply #5 on: Thursday,February 06, 2025, 07:16:38 AM »
I hope you have a better time getting a pro to do your windshield than I had the last time I had one installed!

When I first built my car, I called an installer who said he would do it but not guarantee it so I called another who came over to install it. While he was working, I mentioned the first guy not wanting to guarantee his work and he said he wouldn’t guarantee his work either! He did a great job and it didn’t leak.

Then I got a star in my windshield that was too close to the edge to repair so I got another windshield.

I called probably two dozen installers in my area including at least half a dozen who said they specialize in classic cars. When I told them it was a Europa they wouldn’t touch it. I finally I found a company who would do it. The installer spent the whole time complaining about what a pain in the ass it was and how he’d never do another like this (from my perspective, he didn’t do anything different than a what is done for a modern installation) and in the end, he did a crappy job. At least it doesn’t leak.

If there is a next time, I will probably do it myself but then I may not have a choice.

Offline Sparkrite

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Re: Bonded Screen
« Reply #6 on: Friday,February 07, 2025, 01:14:49 AM »
I did mine, but by bonding the trim to the screen first is just making it much more difficult to get a proper seal, and more difficult if not impossible to get the trim to fit the car and screen perfectly.
I bonded my screen in first,then when it was set I cut off the back of the trim before bonding that on,and I got a millimetre perfect fit.

Offline SwiftDB4

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Re: Bonded Screen
« Reply #7 on: Friday,February 07, 2025, 08:08:01 AM »
I did mine, but by bonding the trim to the screen first is just making it much more difficult to get a proper seal, and more difficult if not impossible to get the trim to fit the car and screen perfectly.
I bonded my screen in first,then when it was set I cut off the back of the trim before bonding that on,and I got a millimetre perfect fit.
What adhesive did you use to bond the trim to the screen?

Offline Bryan Boyle

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Re: Bonded Screen
« Reply #8 on: Friday,February 07, 2025, 09:57:24 AM »
I did mine, but by bonding the trim to the screen first is just making it much more difficult to get a proper seal, and more difficult if not impossible to get the trim to fit the car and screen perfectly.
I bonded my screen in first,then when it was set I cut off the back of the trim before bonding that on,and I got a millimetre perfect fit.
What adhesive did you use to bond the trim to the screen?

Not going to answer for Sparkrite...but when I did mine...I primed the frit (edge of the windscreen) with primer, as well as the channel in the trim, and built it up as an assembly (glass, trim, edge pieces) using the urethane mastic that would be used to seat the windscreen. 

I've seen some who cut off the area circled in red, and just filled the channel with mastic, then set the windshield in place then fit the trim into the excess mastic filling the opening. 

I've also seen some folks who've leveled off the windshield opening to the body, and used stick-on trim and mitered ends. 

Depends on your pain threshold.  I did the bond trim to windshield and then install complete kit in opening.  Seemed to turn out ok.  See my entry in 693R's renovation journal http://www.lotuseuropa.us/0693r/journal/index.php?m=11&y=07 and scroll down for October 27, 2007.  Photos in http://www.lotuseuropa.us/0693r/photos/index.php/2007/10-27-07-Windshield
« Last Edit: Friday,February 07, 2025, 10:00:50 AM by Bryan Boyle »
Bryan Boyle
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Commercial Pilot/CFII/FAA Safety Team
Amateur Extra Class Operator & FCC Volunteer Examiner
Currently working on 3291R, ex 444R, 693R, 65/2163, 004R, 65/2678
http://www.lotuseuropa.us for mirror of lotus-europa.com manual site.

Offline Cheguava

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Re: Bonded Screen
« Reply #9 on: Friday,February 07, 2025, 12:17:58 PM »
Although this is a long way away, I already have a windscreen waiting for my TC. Apologies Bill if I have misunderstood, but I can't see a kit including windscreen surrounds and bonding adhesive on their site - have I missed something or have they deleted it?

I think I've been told previously that the surrounds are not quite right, is that still the same (I'll take whatever  can get tbh).

Offline Triton

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Re: Bonded Screen
« Reply #10 on: Friday,February 07, 2025, 01:08:31 PM »
I am going to get my screen re-fit this year, going to wait for a couple of hot days if we get them.  Have been looking at suppliers for parts and costs. I see that SJ Sportcars  sell all the parts separately  including a Bonding Kit at £17.90 inc vat.

Offline Sparkrite

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Re: Bonded Screen
« Reply #11 on: Saturday,February 08, 2025, 12:19:32 AM »
I did mine, but by bonding the trim to the screen first is just making it much more difficult to get a proper seal, and more difficult if not impossible to get the trim to fit the car and screen perfectly.
I bonded my screen in first,then when it was set I cut off the back of the trim before bonding that on,and I got a millimetre perfect fit.
What adhesive did you use to bond the trim to the screen?
I believe I used sikaflex 221 black, but this is less strong than the one recommended by professionals, I chose it because I felt it was a happy compromise between the original butyl type and I had also read if the sealant was too strong the screen may crack under certain conditions. Best do your own research though.

Offline Footer

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Re: Bonded Screen
« Reply #12 on: Saturday,February 08, 2025, 03:11:44 PM »
I have a 73 TCS and will have to do some windscreen work in the spring once it warms up.  After reading these entries, I’m not sure if I have a bonded windscreen or the older version.  How do I tell the difference between the two?
Seperately, I can find replacement instructions in the S1/S2 manual but nothing in the Special addendum.  Do those instructions apply to both windscreen installations? 

Offline TurboFource

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Re: Bonded Screen
« Reply #13 on: Saturday,February 08, 2025, 03:15:12 PM »
TCS has bonded in windshield
The more I do the more I find I need to do....remember your ABC’s …anything but chinesium!

Offline Footer

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Re: Bonded Screen
« Reply #14 on: Saturday,February 08, 2025, 04:43:03 PM »
Thanks Turboforce