Member Since: 03 Jan 2016
Location: Cambridgeshire
Posts: 1263
Tail gate High level rear stop light adhesive…..Puzzled!
Just maybe someone has had similar experience. My rear stop light unseated ( mechanical fixing missing anyway ) and following some threads from here I thought it was an easy fix with a branded “windscreen bonding adhesive”. I am now surprised as two weeks later the tailgate / lens component bond has failed.
Applied on warm sunny day, wiped down all surfaces with rubbing alcohol + put slight tension with clamps for setting and to achieve a shut line. Photo shows no bond at all to plastic lens but plenty on tailgate.
Any ideas on why ?
Dislodged lens
Flat adhesive residue on tail gate
Lens showing no residueD3 2.7 Zermatt silver (not another one)
D3 4.4 V8 Zambezi silver
D3 4.4 V8 Adriatic Blue
D3 2.7 (gone) Tonga Green
D3 4.4 V8 LHD Tonga Green
FFRR TDV8
Defender 300
27th Jun 2022 5:35 pm
ronp
Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15222
I would say that it's faulty bonding agent [unless the light unit was contaminated with a grease film].
I replaced mine a couple of months ago due to some failed LEDs.
It's a heck of a job to replace as it needs to be set about with a lump hammer and bolster chisel to destroy the old light unit [in order to remove], then chisel out the old bonding agent.
There are no mechanical fittings, it relies 100% on the bonding agent.
edited to add: I used Everbuild Tecnic Puraflex 40 High Modulus PU Sealant and Adhesive, Black 300 ml
and all is holding strong
https://www.amazon.co.uk/gp/product/B00HUX...&psc=1I was a normal heterosexual chap, but in these new woke awakenings I now identify as a Wardrobe.
+1 for suspecting contamination on the housing. I'd guess nice shiny clean with silicone based stuff before previous fitting..
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
27th Jun 2022 7:42 pm
aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459
Did you use the activator Or just the bonding agent?Andrew
D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE
27th Jun 2022 7:46 pm
ronp
Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15222
In hindsight, just wondering how the light unit was off in the first place, that required it to be rebonded?I was a normal heterosexual chap, but in these new woke awakenings I now identify as a Wardrobe.
27th Jun 2022 10:13 pm
maxbasscat
Member Since: 03 Jan 2016
Location: Cambridgeshire
Posts: 1263
What a great site this is so many thought provoking answers, some further bits of info that may add to puzzle!
The Copart car was bought with the light de bonded and we thought an easy fix in fact we do not know how it came to be separate , plugging it all in it works. As you cannot usually see the unit dissembled it does “appear” to have some broken locating clips or spacers inside but concede “mechanical fixings is a bit clumsy however the missing bits would not appear to stop a refix exercise.
Why I am sceptical of the cleaning/contamination is that I did clean with the alcohol both lens and tail gate quite well but it does look evident of a contamination failure. Now I think I will look again at the manufacturers instructions as there is no two part solution that I can recall but I may have missed that trick again though the adhesive on the tailgate is really well bonded.
At the moment I am settling upon :
A. Contamination
B. Too much tension used on clamps for set time in order to get the shut line ( we have two full scale models to review ) correctly set
I will start again and use another adhesive as Everbuild Tecnic Puraflex 40 High Modulus PU Sealant and Adhesive, Black 300 ml or TEROSON PU 8596 as here. As a footnote I will report back but I wonder as elsewhere in another thread on here whether it would have saved a lot of time if I would have bought a salvage tail gate so another Saturday on DiscologyD3 2.7 Zermatt silver (not another one)
D3 4.4 V8 Zambezi silver
D3 4.4 V8 Adriatic Blue
D3 2.7 (gone) Tonga Green
D3 4.4 V8 LHD Tonga Green
FFRR TDV8
Defender 300
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... All LED interiors lights, DRLs, Spare Wheel protector.
so another Saturday on Discology
