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Thread: 94 Mercedes leather cracks and colour repair

  1. #1
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    Nov 2023
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    Question 94 Mercedes leather cracks and colour repair

    Good evening.

    I refer you to this these threads that I read and reviewed, similar to my situation - age cracks and lines, no peeling.
    https://www.leathercleaningrestorati...rcedes+leather

    https://www.leathercleaningrestorati...ghlight=filler

    I am in the process of starting leather repair to the front driver side seat - side bolster and seat bottom side (photos attached for driver seat repairs to date).
    Typical age cracks and lines. I am looking to see how I can further prep and prepare the existing leather to complete the proper refinishing:
    The front passenger seat has cracks and lines and I would like to prep and maintain that side from further deterioration over time.

    For the driver’s side, I have applied in light coats a filler and sanded down for the major bolster wear and also on the seat and color matched the color with an upholstery SEM canned paint I ordered thru Concept Finishes in Richmond BC, and airbrushed to match. The repairs (filler) was textured prior to the airbrushing and the result finish was a very good match.
    Unfortunately, the repair patch work with matching leather texture, began to crack so I sanded it down to what you see now to start again.

    I’ve used a filler for the crack filling in what I thought was applied in thin coats. Perhaps I should have done the work in much thinner applications?

    Anyways, I would like to seek you advice on prep, cleaning and maintenance and then repair these age cracks and lines and get the leather to a more improved supple state and prevent the return of the new paint application cracking.

    Thank you.

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    Last edited by mjames228; 11-24-2023 at 09:05 PM.

  2. #2
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    >>> Get the leather to a more improved supple state and prevent the return of the new paint application cracking.

    When leather begins to crack, its usefulness is almost over, no matter how beautiful it looks with refinishing.

    The Hydrator 3.3
    https://leatherdoctor.com/hydrator-3-3/

    and Fatliquor 5.0
    https://leatherdoctor.com/fatliquor-5-0/
    system is the answer to your problem.

    Do you agree after reading through what others have done?

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    Roger Koh
    Leather Care System Formulator
    Consultant / Practitioner / Instructor / Coach
    web: www.leatherdoctor.com
    forum: www.leathercleaningrestorationforum.com
    email: [email protected],
    email: [email protected]
    phone: 604 773 1878

  3. #3
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    Hello Roger,

    Sorry for this late reply.
    This seems this would be a proper direction to take. The leather finish on the front seats is not super hard or stiff. Quite pliable considering being 28+ years old.
    I will use these 2 items to get them to a supple state.

    I reviewed the application process.
    I presume the application of these 2 porducts is best suited with the leather at room temperature or above?

    Once this is complete, I will look at refinishing again, where applicable.

    Thank you for your advice on this.

  4. #4
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    >>> I presume the application of these 2 products is best suited with the leather at room temperature or above?

    Yes, you are correct. You may also like to warm the distilled water before mixing on cold days.

    Remember, these hydrating and fatliquoring processes are to go below the finishes and fully absorbed by the leather structure.

    I recommend that the existing finishes be removed as much as possible, so that it does not become too thick with further new application. You may want to test out the Micro 54 and Micro Top 54 systems which produce a more flexible finer finish, before your actual application.

  5. #5
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    Hello Roger,
    Products arrived in a timely fashion. Thank you.

    In response to your recommendation in post #4;
    I applied a couple of very light airbrushing coats of sem upholstery paint overall. The areas sanded down that you see in post #1, is where the cracks opened up again. The third photo below the first 2, is what was present before I applied a light airbrushing to to match the overall color. finish.

    Should I be then lightly sanding down these areas too (to remove the airbrush paint), cleaning the surface up, and then follow the procedure; first with the hydrator 3.3 and then the fatliquor 5.5?
    I plan to tackle these two side bolster areas first. These were the worst of the leather cracking (no peeling).

    The others parts of the front driver and passenger seats (front under the kneed bolster and perforated seat bottom, have signs of age cracking) and some stiffness ==> photos attached

    Drivers front seat: front bolster and perforated bottom:

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    Should I work to sand down these areas too, to apply the hydrator and the fatliquor ?

  6. #6
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    Hi Roger,
    Your pkg arrived fast today and I reviewed briefly the documents.
    I will have to pick up distilled water tomorrow and hopefully get started on the first areas in post #1.
    Perhaos I should start lightly sanding down the other areas of the front passenger seat first (post #6), cleanup to start the entire driver's set bottom and bolsters with hydrate first?

    Also, photos attached here
    Passenger front seats and bolster have only been cleaned up - no airbrushing work.

    Similar, but less wear, in leather cracks to the driver front seat:

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    Last edited by mjames228; 11-29-2023 at 09:07 PM.

  7. #7
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    I have a light airbrush on the driver's seat back support side bolster as well as on the bottom seating side bolster and front bolster. The perforated set bottom also has a light airbrush to get uniform colouring to be consistent but no work done on it, other than the application of leatherique, in past.


    Front seats Driver side:

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    Last edited by mjames228; 11-29-2023 at 09:08 PM.

  8. #8
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    >>> Perhaos I should start lightly sanding down the other areas of the front passenger seat first (post #6), cleanup to start the entire driver's set bottom and bolsters with hydrate first?

    Yes, do a test-out area, so you know how the product responds.

    Remember, once Hydrator 3.3 hydrates the leather, Fatliquor 5.0 has to follow immediately. It is the Fatliquor 5.0 that softens the leather.

    You may have to remove the finishes to the leather crust easier for both Hydrator 3.3 and Fatliquor 5.0 to do their work.

    A bamboo toothpick is an idea to clear up the perforated holes to standardize the size and products to get into the fiber structure.

    Impregnator 26, found in this Leather Repair Kit A8.r
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    https://leatherdoctor.com/leather-repair-kit-a8-r/
    applied along the clean-up cracks after fatliquoring (Hydrator 3.3 and Fatliquor 5.0) helps strengthen the leather.

    Bond 3D with suede fibers will reduce cracking as fillers instead of 'fillers' that crack easily.

  9. #9
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    Quote Originally Posted by Roger Koh View Post
    >>> Perhaos I should start lightly sanding down the other areas of the front passenger seat first (post #6), cleanup to start the entire driver's set bottom and bolsters with hydrate first?

    Yes, do a test-out area, so you know how the product responds.

    Remember, once Hydrator 3.3 hydrates the leather, Fatliquor 5.0 has to follow immediately. It is the Fatliquor 5.0 that softens the leather.

    You may have to remove the finishes to the leather crust easier for both Hydrator 3.3 and Fatliquor 5.0 to do their work.

    A bamboo toothpick is an idea to clear up the perforated holes to standardize the size and products to get into the fiber structure.

    Impregnator 26, found in this Leather Repair Kit A8.r
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    https://leatherdoctor.com/leather-repair-kit-a8-r/
    applied along the clean-up cracks after fatliquoring (Hydrator 3.3 and Fatliquor 5.0) helps strengthen the leather.

    Bond 3D with suede fibers will reduce cracking as fillers instead of 'fillers' that crack easily.
    I have been digesting and learning with this sticky post, so far:
    https://www.leathercleaningrestorati...on-my-BMW-335i
    A wealth of information just in that one sticky.

    I am eager to learn this process (have more time to myself this winter) plus I have a several seats I would like to address and maintain.

    I'm happy you brought up, into this conversation the repair kit. I was looking at it, prior to ordering.

    If I am reading the literature correctly on this repair kit, the cracks (as shown in my example for both the perforated seat bottoms and the bolsters) are bonded using this kit?

    If I may ask, how and when after, is this "repair kit process" applied?



    btw, I've been reading up/watching on the fatliquoring process and the use of egg yolks ?
    Very interesting stuff.
    Sorry, but I wont be breaking any eggs to do this; my neighbor has hobby chickens and the eggs we get from them, are strictly for eating.

  10. #10
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    >>> If I may ask, how and when after, is this "repair kit process" applied?

    Impregnator 26 to tighten the loose structure comes first before bonding repair with Bond 3d.

    How to Repair Cracks on Leather with Bond 3D?

    1* Leather is degreased, pH balanced, clean, and rinse accordingly.

    2* Soiling is removed and scrap cleaned to reveal the suede fiber.

    3* Fillers like thread and suede fiber are used as fillers and bond with Bond 3D.

    4* This system will ensure the bonding is stronger and lasts longer when compared with other filling types of products.

    5* Note: Leather filler and stucco repairs often show signs of early failure in cracking and your refinishing to cover it up has gone to waste too soon.

  11. #11
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    So for my passenger front set, which has only had leather conditioner applied to it (no repairs), what is the product to use for *1 & *2?

    *3 sounds like the product information you provided in post #8.

    For for front driver's seat, as stated, I plan to sand lightly the front bolster to remove the airbrushing any "light fill" that may have been used (I will have to review my notes on the work I performed on this seat).

    I presume, I proceed would proceed with *1 & *2, as I would do with the paseenger front seat?

    Cheers.

  12. #12
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    This is the sequence of the process to proceed . . .

    A copy and paste from:
    https://leatherdoctor.com/auto-leath...ng-kit-ap7-cl/

    Auto Leather Color Refinishing Kit Ap7.cl by Leather Doctor is for abrasion damages from friction rubs while getting in and out of the seat. Most of these repairs may range from missing finishes to abrading damages to the leather structure. Some areas may be contaminated with foreign soiling as conditioners, protectors, body oil, grease, sweat, and alkaline overexposure with all-purpose cleaners.

    A comprehensive repair for a long-term solution will require a holistic approach to dealing with the exposed structure and surface finishes.

    The practical and functional suppleness of the leather depends on the structure and the average thickness between 0.9 to 1.2mm from stiffness and cracking.

    The aesthetic aspect of the leather finishes averages 0.02mm (or 20 microns) in thickness for practical compressing and flexing from cracking.

    How Leather Color Refinishing Works!

    Step*1 A preview of a holistic leather-safe restoration system begins by stripping with Stripper 2.3 and rinsing with Rinse 3.0.

    Step*2 Degreasing with Degreaser 2.2 follows with Acidifier 2.0.

    The suffix numbers of these four products denote their pH value for recharging the protein fiber ionic positive besides the act of decontamination.

    The leather integrity is revitalized or reconditioned once the ionic attraction between the positive protein fiber and its other constituents like the tanning agent and fatliquor (fat and oil) is activated.

    Step*3 Leather suppleness is accomplished with Hydrator 3.3 and Fatliquor 5.0 rejuvenating system.

    Step*4 Structural weakness from overstretching is re-strengthened with Impregnator 26, while uneven absorption is sealed with Adhesor 73. These repair and auxiliary products are necessary to reduce the need for color coating and increase its flexibility and stretchability from premature cracking.

    Step*5 Color Refinishing with Micro 54 is the first pad with subsequent air brushing for professional results. The top coating is finished with Micro Top 54.

    Step*6. Protector-B imparts a non-stick, rub-resistant surface with a buttery feel, reducing noises that translate into less friction wear. As the leather surface is well lubricated, it reduces the compression of heavy body contact reducing compressed creases and wrinkles.

  13. #13
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    Thank you Roger.
    I was reviewing the Sticky's at the top - informative.

    Are all these pkgs concentrates to mix ourselves?

    As an example, Everything shown in the link is included? Including the spray bottles?
    https://leatherdoctor.com/auto-leath...ng-kit-ap7-cl/

  14. #14
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    >>> Are all these pkgs concentrates to mix ourselves?

    All Kits come in concentrates and need distilled water to mix and fill and are ready to use. Very few products come ready to use.

    >>> As an example, Everything shown in the link is included? Including the spray bottles?

    Spray bottles are included in the kit as shown. Others may be subject to changes as we are constantly improving our kit bundles.

  15. #15
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    I was reviewing this kit and the products - https://leatherdoctor.com/auto-leath...ng-kit-ap7-cl/

    It has a colour component application in this kit?

    How would the colour options indicated, be applicable to matching the interior leather colour to my interior(s) (mine being a mercedes (beige) mushroom colour, which I already have the matching custom interior paint) (black is the other colour of my other MB seats)


    Also, in reviewing the Sticky's, this particular one - post #5 - https://www.leathercleaningrestorati...ture-Showcase:
    Are the components specifically, in that thread, for stains (ink/ jean staining, etc)?

    Thank you.

  16. #16
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    >>> I was reviewing this kit and the products - https://leatherdoctor.com/auto-leath...ng-kit-ap7-cl/
    It has a colour component application in this kit?


    Auto Leather Color Refinishing Kit Ap7.cl
    https://leatherdoctor.com/auto-leath...ng-kit-ap7-cl/ comes with one color of choice.

    To mix and match you will need other extra Micro 54 colors to choose from this link.
    https://leatherdoctor.com/micro-54/
    And when you scroll down you see a color matching sample.

    >>> How would the colour options indicated, be applicable to matching the interior leather colour to my interior(s) (mine being a mercedes (beige) mushroom colour, which I already have the matching custom interior paint) (black is the other colour of my other MB seats)

    The only color-matching system is based on the Micro 54 Color Shading Examples.


    >>> Also, in reviewing the Sticky's, this particular one - post #5 - https://www.leathercleaningrestorati...ture-Showcase:
    Are the components specifically, in that thread, for stains (ink/ jean staining, etc)?


    For Ink Removal on Auto Leather Seat use Prep 7.7
    https://leatherdoctor.com/leather-prep-7-7/

    and any residue can be further removed with Clean Dye 7.9.

    Dye stain transfer from jeans and clothing use Clean Dye 7.9
    https://leatherdoctor.com/clean-dye-7-9/

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