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Worm casts on my alloys
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userCruisecontrol
Posted: 15 October 2021 10:18 AM
Subject: Worm casts on my alloys
 


Pops in from time to time

Posts: 118
100
Location: Chandlers Ford, Hants


Well they look like worm casts, as you can see from the pictures.

Over the years they are getting increasingly worse on our Fiat Ducato 2016 Burstner Nexxo 690G. All wheels affected and I’ve noticed similar markings on the wheels of other Fiat vans of that age range, some with similar degradation – others with barely a mark at all.

What to do about it? Take it to an alloy re-vamping specialist? Could be expensive. Any suggestions will be welcome as sometime down the line we will change the van& I suspect its value will be affected by these markings.




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userDerek Uzzell
Posted: 15 October 2021 10:51 AM
Subject: RE: Worm casts on my alloys
 


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Location: MODERATOR - 2015 Rapido 640F LHD 2.3ltr 150bhp


The 'bubbling' problem is pretty common. There's a photo here

https://www.torquecars.com/articles/wheel-repair.php

You could attempt a DIY repair (plenty of advice online) or get a specialist to do it.

If you want to attach a photo, the file size must not exceed 100KB. Refer to the final posting on this recent forum thread

https://forums.outandaboutlive.co.uk/forums/Motorhomes/Motorhome-Matters/Leisure-Battery-fully-charged-but-not-operating-anything-/58969/
userSAlexander
Posted: 15 October 2021 11:17 AM
Subject: RE: Worm casts on my alloys
 


Liking what I've found

Posts: 60
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Location: Scotland Rapido 640F


Getting alloys refurbished isn't actually too expensive, typically can be £200 - £250 for a set of four.
userCruisecontrol
Posted: 15 October 2021 11:30 AM
Subject: RE: Worm casts on my alloys
 


Pops in from time to time

Posts: 118
100
Location: Chandlers Ford, Hants


Yes sorry about the pics - had to resort to Paint Shop pro to reduce. I'll have a look at the previous torque file, thanks Derek
userBrock
Posted: 15 October 2021 4:56 PM
Subject: RE: Worm casts on my alloys
 
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Location: Wirral - 2013 Hymer BClass 504 130bhp


Hymer replaced my 2013 alloys after a year. Refused at year 3 as the warranty was out. So I had the alloys powder coated in 2018. Over 3 years later, my powder coated wheels still look good. Only difficulty I had was finding a powder coating firm which could jack up the van and remove the wheels to do the job. £336 for 4.
userTracker
Posted: 15 October 2021 7:37 PM
Subject: RE: Worm casts on my alloys
 


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Location: Vanless in Evesham.


Do bear in mind that if you do have the wheels repainted the same thing will probably happen again in a year or too.

Best solution - don't look at the wheels!!
userDerek Uzzell
Posted: 16 October 2021 8:35 AM
Subject: RE: Worm casts on my alloys
 


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Location: MODERATOR - 2015 Rapido 640F LHD 2.3ltr 150bhp


Cruisecontrol - 2021-10-15 10:18 AM

Well they look like worm casts, as you can see from the pictures...



The term usually used for this type of damage seems to be “snail trails” and it’s mentioned in this Mercedes-Benz Owners forum discussion

https://forums.mercedesclub.org.uk/index.php?threads/snail-trails-on-my-wheels.181144/

and this MHFun thread

https://www.motorhomefun.co.uk/forum/threads/alloy-wheel-pitying.216110/

has the following comment

Your alloy wheels are what is known as "Diamond cut" and they are notorious for getting worm like markings underneath the lacquer that the manufacturers apply in the factory. This is really well known in the car industry and is a total pain! You can get insurance for them but it's expensive. You can get them "refinished" by alloy wheel refurb companies. But perceived wisdom is to only clean them with hot water and a sponge, the chemicals in car washes and pressure-wash spray booth type places is very aggressive on the lacquer and they are also very susceptible to tiny stone chips. It appears that once the lacquer has been breached the salty and acidic water that inhabits any wet road surface gets into the damaged area and then the aluminium oxidisation process begins, hence the worm like marking. Normal alloy wheels have a coating of paint or powder coating before they get the lacquer. Diamond cut wheels only have the lacquer...... Get different wheels fitted is, I think, the best long term advice.....
userCruisecontrol
Posted: 16 October 2021 10:13 AM
Subject: RE: Worm casts on my alloys
 


Pops in from time to time

Posts: 118
100
Location: Chandlers Ford, Hants


Thanks Derek, that explains matters, although I don't use a pressure wash. I do however use a brush and standard "car" cleaning fluid. In future I'll be be less vigorous!
userpelmetman
Posted: 16 October 2021 7:05 PM
Subject: RE: Worm casts on my alloys
 


Walks with the gods

Posts: 37826
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Location: A different planet to you


I had the alloy wheels on the car I keep in Spain painted in two colours to suit the car .......

It was a lot cheaper than a new set of alloy's ......





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userCruisecontrol
Posted: 18 October 2021 2:20 PM
Subject: RE: Worm casts on my alloys
 


Pops in from time to time

Posts: 118
100
Location: Chandlers Ford, Hants


Thanks to all for comments.
Yes the cause seems to be corrosion under the lacquer.

I've obtained quotes from a few "refurbishers" in the Hampshire area. The general cost is around £100 per wheel - cheaper if opting for a "powder coat".

For the moment I think I'll take the advice and "not look at them".
userlancepar
Posted: 19 October 2021 1:02 PM
Subject: RE: Worm casts on my alloys
 


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Posts: 326
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Location: Quarry Bank DY5 '05 Fiat AutoTrail Cheyenne 635SE


From my alloy wheel refurbers they say, as already mentioned it's corrosion.

This is how they explained it to me.

On a rim whether polished or not, then coloured, an Etching Primer has to be applied before the finishing coat or powder coat to get it to stick to the alloy.. An EP would show under a clear aplication of lacquer so doesn't get done. Therefore any miniscule chips in the clear coat will allow corrosion to start underneath.

I you have yours refurbed, have the bare polished areas coloured silvery.

Edit: £100/wheel sounds excessive to me.

B-)

Edited by lancepar 2021-10-19 1:05 PM
userDerek Uzzell
Posted: 19 October 2021 1:47 PM
Subject: RE: Worm casts on my alloys
 


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Location: MODERATOR - 2015 Rapido 640F LHD 2.3ltr 150bhp


Online entries indicate that alloy wheel refurbishment costs can vary quite significantly. This website gives the average price for repairing a single diamond-cut wheel as £114.

https://www.checkatrade.com/blog/cost-guides/alloy-wheel-refurbishment-cost/
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