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MussEd



Member Since: 20 Feb 2013
Location: East Lothian
Posts: 354
Scotland 2013 Defender 110 Puma 2.2 USW Baltic Blue
HD Drive Member paint problem
I’ve spent some time this last couple of days preparing a pair of shiny new HD drive members. Two coats of etch primer, then several coats of Simoniz tough smooth black spray. All was great till I went to fit them tonight.

Following other threads I’ve read on the subject I used zinc plated cap screws and matching spring washers and as soon as I nipped them up (before I even got Torque wrench out) the paint stripped around the screws...what have I missed? The picture shows the flange I tried to fit this evening above the other, which I haven’t!



Click image to enlarge
Post #869821 26th Nov 2020 10:40pm
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Badger110



Member Since: 06 Feb 2018
Location: South hams
Posts: 1039
United Kingdom 2011 Defender 110 Puma 2.4 USW Buckingham Blue
The primer/paint hasn't bonded to the metal.

Even with an etch primer, you will struggle to get a paint to withstand the pressure of mechanically fixing something to it without proper curation times and a lot of luck.
Post #869824 26th Nov 2020 11:13pm
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Likeomg



Member Since: 29 Jun 2012
Location: Lake District / Newcastle
Posts: 2644
2010 Defender 90 Puma 2.4 HT Stornoway Grey
mount them and mask up and spray over the bolts ?
Post #869825 26th Nov 2020 11:18pm
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MussEd



Member Since: 20 Feb 2013
Location: East Lothian
Posts: 354
Scotland 2013 Defender 110 Puma 2.2 USW Baltic Blue
Badger110 wrote:
The primer/paint hasn't bonded to the metal.

Even with an etch primer, you will struggle to get a paint to withstand the pressure of mechanically fixing something to it without proper curation times and a lot of luck.


I left the primer for over the recommended 24 hours. Guess I’ll need to try again...And hope for more luck!
Post #869829 26th Nov 2020 11:32pm
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MussEd



Member Since: 20 Feb 2013
Location: East Lothian
Posts: 354
Scotland 2013 Defender 110 Puma 2.2 USW Baltic Blue
Likeomg wrote:
mount them and mask up and spray over the bolts ?


It might come to that...
Post #869830 26th Nov 2020 11:32pm
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bankz5152



Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2187
2004 Defender 110 Td5 DCPU Epsom Green
I used Buzzwelds GIO. Let them sit for 24 hours

Paint still there when I did the nuts up Instagram @defender_ventures
Empire Tuning - Agent
Post #869841 27th Nov 2020 6:03am
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324
United Kingdom 
I know that you've followed the process that I described when I did mine. I can only think it's either the paint itself or perhaps the temperature, as I did mine in the summer Confused Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #869842 27th Nov 2020 6:17am
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SteveG



Member Since: 29 Nov 2011
Location: Norfolk
Posts: 661
2005 Defender 90 Td5 CSW Belize Green
Did you scotchbrite and fully degrease the surface before etch priming?

I have no idea how good the primer and Simoniz paint you’re using are, but you’d also ideally need to leave them for 7-10 days to fully harden before fitting.

Or buy the black HD ones from Bearmach 😉😉😉
Post #869843 27th Nov 2020 6:21am
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LR90XS2011



Member Since: 05 Apr 2011
Location: bickenhill
Posts: 3645
United Kingdom 2011 Defender 90 Puma 2.4 XS CSW Galway Green
did you use a spring washer, cap heads or bolts?

remember the paint will affect the mechanical torque, the best approach is to clean off or mask where the bolt head or washer will meet the drive member, if spraying just place washers where the bolt heads will be when fitted. effectively masking the fixing area DEFENDER 90 TDCI XS,

I hope everyone is well and your land rovers make you happy
Post #869847 27th Nov 2020 6:46am
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MussEd



Member Since: 20 Feb 2013
Location: East Lothian
Posts: 354
Scotland 2013 Defender 110 Puma 2.2 USW Baltic Blue
Spring washers with cap head screws.

LRA - The temperature may play a part I guess. Think I’ll sand it all off, etch prime again and leave till I’m back at work Tuesday and can apply paint indoors in warmer atmosphere. Just done loads of work in the house, indoor spraying would NOT be appreciated!

LR90XS -
Quote:
the best approach is to clean off or mask where the bolt head or washer will meet the drive member, if spraying just place washers where the bolt heads will be when fitted. effectively masking the fixing area
Great tip! Will do this too...thanks for the advice guys.
Post #869885 27th Nov 2020 10:04am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17466
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
The appearance in the photos suggests that the surface was not adequately degreased before paint, and as a result the etch primer hasn't etched and and the paint hasn't adhered.

There shouldn't be any particular problem painting a yellow passivated finish, one of the benefits of the passivation process is that it can help with paint adhesion provided that a suitable paint system is used.

I would be looking closely at the preparation processes.
Post #869892 27th Nov 2020 10:20am
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Balvaig



Member Since: 19 Feb 2016
Location: Fife
Posts: 732
Scotland 2016 Defender 90 Puma 2.2 Landmark LE Corris Grey
If you can get away with it - i put small items after prep and painting and leaving for 24 hours nto the domestic oven at 50 -60 for an hour.
Cures the paint a treat.

SWMBO is usually out during this period, but wonders about the odd smell when she gets back. Whistle
Post #869901 27th Nov 2020 10:58am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17466
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
^^ It's not just me who does this then! Rolling with laughter
Post #869915 27th Nov 2020 12:43pm
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MussEd



Member Since: 20 Feb 2013
Location: East Lothian
Posts: 354
Scotland 2013 Defender 110 Puma 2.2 USW Baltic Blue
Balvaig wrote:
If you can get away with it - i put small items after prep and painting and leaving for 24 hours nto the domestic oven at 50 -60 for an hour.
Cures the paint a treat.

SWMBO is usually out during this period, but wonders about the odd smell when she gets back. Whistle


Given I’m the chief cook and bottle washer when I’m not at work I’d probably get away with that!
Post #870093 28th Nov 2020 1:05pm
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MussEd



Member Since: 20 Feb 2013
Location: East Lothian
Posts: 354
Scotland 2013 Defender 110 Puma 2.2 USW Baltic Blue
Finally got my new flanges painted properly and fitted today. Thanks for all the help and advice.
Post #872942 14th Dec 2020 8:15pm
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