Road Salt & Vehicle Undercarriage Protection

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Thread: Road Salt & Vehicle Undercarriage Protection

  1. #1
    TOGWT's Avatar
    TOGWT is offline Member
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    Oct 2009

    Default Road Salt & Vehicle Undercarriage Protection


    After removing dirt, road grime, and etc with a pressure washer (Karcher Model K5.93M) neutralise the effects of the acidic road salt on the suspension / undercarriage (See also Road salt)

    •Thoroughly spray an undiluted citrus cleaner (P2IS Total Auto Wash) and let it soak in; remove by thoroughly rinsing with water. If you have a pressure washer available, fill tank with citrus cleaner and spray undercarriage (do not use excess pressure as water may penetrate crevices and seams where it cannot drain, causing corrosion), let it soak and then remove with plain water
    • Spray undercarriage with (Chemical Guys Bare Bones ) one application will leave no residues, noxious fumes or flammable solvents
    • Or apply POR-15 Marine Clean™ and then two coats of a rust inhibitor paint (POR-15 ) allow each coat to dry

    Alternative product -

    Wurth High Build Underbody Sprayproduces a jet black, textured finish in wheel wells and on lower rocker panels. This spray will hide a multitude of blemishes and make old wheel wells look factory new. Provides permanent yet flexible protection against flying stones, rust, water and road salts

    Wurth SKS Stone Guardmatches OEM Factory applied stone protection on vehicles such as BMW, Fiat, Mercedes-Benz, Porsche and Renault. For use on door sills, front and rear body parts, mudguards, under bodies, rocker panels, etc. Wurth SKS Stone Guard is a water based product and offers easy clean-up. Wurth SKS is paintable and can be top coated with solvent based urethane or water-borne top coats (available in Black or Grey)

    Road Salt

    The salts (often mixed with grit / sand for tyre adhesion) commonly used are;

    (a) Sodium chloride (NaCl) the most common salt used
    (b) Calcium chloride (CaCl2) works at lower temperatures than sodium chloride.

    Although salt is inert when subjected to freezing (15 – 20.oF ) it’s considered the lower limit for salt to melt snow/ice but once H2O, even in the form of moist air (i.e. humidity) is added the freezing point is lowered and the saline solution(salt/water) will have an adverse effect on the vehicles paint and undercarriage. When washing the vehicle ensure that all salt is removed to avoid a saline solution remaining on the paint finish. Using a durable protection (Collinite Insulator Wax) will provide a sacrificial and renewable protection to the vehicles paint finish.
    Magnesium chloride (MgCl2) is very effective even at the lowest temperatures but also contains the most aggressive corrosives (especially on glass surfaces) and (d) a sprayed brine solution, it is used to prevent snow / ice adhesion to the road surface. Needless to state that all these salts are acidic / corrosive.

    Once you've removed the ice / snow it may be advisable to 'neutralize ' the residue road salt with an alkaline solution, ( especially from the undercarriage and suspension

    Anti-icing liquids- according to State authorities the liquid consists of - Magnesium chloride, calcium chloride and other liquids works like anti-freeze by lowering the freezing temperature of water and preventing ice from forming a strong bond to the road’

    An extract from one of a series of unbiased “Detailing Technical Papers” © TOGWT ™ Ltd Copyright 2002-2009, all rights reserved.
    ~ Providing unbiased advise that professional and enthusiast detailer’s trust ~ “The Art & Science of Detailing” - Hidden Content

  2. #2
    Zenith is offline Senior Member
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    Aug 2009
    Denver/Orange County


    Always great info!!!! Colorado uses Mag Chloride and it is some ugly stuff!!

    Thanks for posting and sharing your knowledge!!


  3. #3
    TOGWT's Avatar
    TOGWT is offline Member
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    Oct 2009


    MgCl2 is 'green' for plant life and animals but no so good for vehicles
    ~ Providing unbiased advise that professional and enthusiast detailer’s trust ~ “The Art & Science of Detailing” - Hidden Content

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