Magazines:  Real Estate Shopping: Adult Costumes  |  Kids Costumes  |  Car Books  |  Guitars |  Electronics
This Issue Archived Articles Blog About Us Contact Us
SEARCH


Getting into Leather

Restoring a leather interior to near-new condition

by Julian Edgar

Click on pics to view larger images


This article was first published in 2009.

These days, used prestige performance cars are so cheap you could easily find yourself steering a retro rocket. But when it comes time to look inside, you might see something that's completely foreign to you in car interiors - leather.

Leather is a strange stuff. Made from cowhide - but with a whole lot of steps along the way - it's a natural substance that responds in a very different way to vinyl. It's likely that an older car with a leather interior will be showing seats and door trims that look a bit faded, a bit dry and stiff. There's basically nothing that you can do about vinyl that's in this condition, but with leather it's possible with the right conditioners - and a lot of patience - to bring the material back to looking near new.

Magic? You'd better believe it.

But whatever you do, don't apply vinyl restorers or treatment to leather - it'll make it look a whole lot worse and may even cause irreparable damage.

Cleaning

Click for larger image

The first step in restoring the look and feel of a leather interior is to clean it. Dirt is highly abrasive and will hasten the wear that the leather is experiencing. That's especially the case if you rub the dirt in when you're applying conditioner - which is why a thorough clean is the first step.

Dedicated cleaners are available for leather and these should be used. As the first step, try the cleaner out in an unobtrusive spot to make sure that the leather remains colourfast with that particular cleaner. All automotive leathers are dyed - you don't want to dye coming off as you clean...

Apply the cleaner to a damp sponge and gently rub it in a circular motion on each leather panel, trying to prevent it from seeping in along the seams. Leave for a few minutes and then wipe off with a damp, soft, lint-free white cloth. The cloth should get grubby fairly fast (that's the dirt coming off) so change it frequently.

If the dirt is ingrained (especially on light coloured leathers), a nail brush and soapy water can both be sparingly applied.

Conditioning

The major step in restoring the look of leather is in the conditioning. Leather conditioners contain waxes and oils that are absorbed by the leather, bringing back the look and feel. However, they come in lots of different 'strengths' - what you use on leather in good condition isn't what you use when you're trying to bring something back from the dead.

Click for larger image
Typically, the leather conditioners sold by car manufacturers are very mild. For example, BMW sell a leather conditioner which is excellent on good condition leather. It's also quite cheap. However, applying just the same stuff to leather that's dry and old will result in the leather conditioner disappearing into the surface - and no apparent change to the leather.

What's needed is something aimed at worn surfaces. Mothers Leather Conditioner is a good next step, suitable for most leathers that have had a few years pass under their belts (or bums sitting on them, for that matter.) But in really tough cases it's a good idea to go to leather conditioner designed more for leather jackets and shoes. The reason that these latter ones aren't the first pick is that they can stain clothing - but in the case of worn leather, pretty well all the conditioner will be completely absorbed and so none will be left to stain any clothes, anyway. (Note that these 'strong' conditioners can also darken the colour of the leather - fine on blacks and browns but not so good on cream leather.)

Click for larger image
Apply the conditioner to a clean damp rag and wipe over the leather, one panel at a time. A clean paintbrush can be used to apply the conditioner in tight spots.  The cream should be applied quite lavishly and left for a few minutes, before being wiped over again. (If you apply it sparingly in the first instance it doesn't get a chance to be absorbed.) If the leather is badly worn, the conditioner may need to be applied with a small sponge.

On perforated leather, apply the conditioner to the cloth or sponge - rather than the leather itself - before wiping the leather. This will prevent a lot of the conditioner disappearing straight into the interior of the seat.

Click for larger image
Be patient during the conditioning process. This is not like spraying vinyl with Armor-All, where a glossy shine is the immediate reward. A car with good condition leather will still take a few hours to have its interior cleaned and conditioned, while a car with worn leather may need three or even four treatments, spaced a day or so apart. Beware of the initial flush of enthusiasm - most old leather looks a heap better after just the first application of conditioner... but a day later when all the conditioner has been absorbed, it can look pretty much as it did before! That's the clue that you need to do the process again... and again.

Once the leather has been fully treated, you may be concerned that it looks dull. However, buffing with (another) soft, lint-free cloth will bring back the shine. Following restoration, further treatments will be needed every 3-6 months, depending primarily on how much sun the interior is exposed to.

Doing It

The black leather (apparently it's actually buffalo hide) in this 1985 BMW 735i didn't have any tears or really bad scratches, but it looked very faded and had colour variations through it.

The best restorative proved to be Renapur Leather Balsam which contains beeswax and jojoba oil. It's applied with a small sponge and goes a long way - just as well, as some parts of the interior required three treatments. However, the difference that it made was extraordinary.

Click for larger image
Here's the side of the centre console before (it's worth clicking on the pic to enlarge it)...

Click for larger image
...and here it is after treatment. The dry whitish appearance of the leather has been replaced by a rich, lustrous black.

Conclusion

If you're looking at buying a used car with leather, keep in mind that even if the interior looks quite shabby, so long as there aren't tears and the leather hasn't gone completely hard and brittle, it's possible to make it look a million times better at very little cost. And even if it's badly faded, leather dyes are available to bring it back up to condition.

Making Leather

Sure, you start with a cow, but what happens after that?

Click for larger image

1. Soaking
Soaking removes dirt and salt from the raw hides.

Click for larger image
2. Fleshing
In this operation unwanted connective tissue, flesh and fat are cut away with sharp knife cylinders.

Click for larger image
3. Liming
Hair is detached by immersing the hides in a liquid containing lime and sulphur compounds.

Click for larger image
4. Bating, pickling, tanning
Bating and pickling are operations in which the hides are treated with acid and salt to prepare them for tanning agents, so converting the hides into leather.

Click for larger image
5. Shaving
The grain leather is brought to a uniform thickness. Unevenness is removed from the back, then the pieces are grouped into batches for dyeing.

Click for larger image
6. Neutralizing, filling, dyeing and fatliquoring
First the acid from tanning is neutralized. The leathers, depending on type, are then filled and dyed with aniline dyes. Finally, fatliquors are added to impart the desired softness to the finished leathers.

Click for larger image
7. Drying
Two methods are used for drying leather: vacuum drying in which the moisture is suctioned off, and suspension drying in which the leather is transported through drying ovens.

Click for larger image
8. Staking
To soften the leather after drying, it is mechanically flexed (staked) and in further operations readied for dressing

Click for larger image
9. Dressing
Here, in a final surface treatment, the leather acquires its ultimate appearance. A glossy or dull, plain or multicoloured, smooth or grained surface is obtained, depending on fashion requirements, by grounding, application of colorants, seasoning, embossing and ironing. The art of dressing consists in applying extremely thin surface films to the leather without impairing either its appearance or its prized natural properties such as suppleness and permeability to air ("breathability").

Click for larger image
10. Quality control
Quality is repeatedly checked between the various operations. Final checking ascertains whether the individual production batches fully match the specification or customer's sample. The leathers are also sorted in line with various quality criteria.

Courtesy of TFL Ledertechnik GmbH & Co. KG

Did you enjoy this article?

Please consider supporting AutoSpeed with a small contribution. More Info...


Share this Article: 

More of our most popular articles.
Measuring how air flows in and under a car

DIY Tech Features - 28 May, 2004

Undertrays, Spoilers & Bonnet Vents, Part 1

DIY timer module adds delays or extended 'on' periods to any electric car function

DIY Tech Features - 1 September, 2008

The eLabtronics Timer

Achievable and real-world ways to reduce your fuel bill

Special Features - 25 August, 2008

Improving Fuel Economy

How they built the fastest diesel on Earth

Special Features - 30 January, 2007

350.092 mph - Breaking the Diesel Speed Record

A day of testing with the Hyundai i30 diesel rally car

Special Features - 18 May, 2010

Pushing Limits

How electric power steering systems work

Technical Features - 23 July, 2008

Electric Power Steering

A forgotten Japanese classic

Special Features - 6 January, 2009

Mitsubishi Colt Fastback

How Mitsubishi developed the vortex generators on the Lancer

Special Features - 3 October, 2006

Blowing the Vortex, Part 2

Wrapping-up our brilliant DIY electronic car modification series

DIY Tech Features - 10 March, 2009

How to Electronically Modify Your Car, Part 13

A real and effective $75 handling upgrade

DIY Tech Features - 8 December, 2004

Rear Sway Bars: Improving FWD Handling

Copyright © 1996-2017 Web Publications Pty Limited. All Rights ReservedRSS|Privacy policy|Advertise
Consulting Services: Magento Experts|Technologies : Magento Extensions|ReadytoShip