Tested: SDoc100 Corrosion Protectant review

John Milbank, BikeSocial Consumer Editor
By John Milbank
BikingMilbank BikeSocial Consumer Editor, John owns a Yamaha MT-10 and Honda Grom. He's as happy tinkering in the workshop as he is on twisty backroads, and loves every bike ever built (except one). He's bought three CBR600s, a KTM 1050 Adventure, two Ducati Monsters, several winter hacks, three off-roaders, a supermoto pit bike, a Honda Vision 50 and built his own custom XSR700. 


Tested: SDoc100 Corrosion Protectant review


Date tested: April 2018 | Price: £13.99 for 300ml can| www.motohaus.com


SDoc100 Corrosion Protectant is intended to be used regularly on your bike, and comes in an aerosol can that’s easy to spray onto your machine and into the areas around the engine.

Like any of these products, it mustn’t be allowed to contaminate your tyres or brakes.


SDoc100 Corrosion Protectant performance

While the graph shows some corrosion from week one on the plate sprayed with SDoc100, this was only at the very edges. While some others didn’t corrode as quickly here, this creeping in on the sharp corners is less of a concern as it is on the face of the plate, where SDoc100 performed better than ACF-50 (it’s less liquid) and the other non-specific corrosion protectants, but it wasn’t the best in test.

When rinsing was switched to a more aggressive fan pattern at the end of the week, the protection degraded more quickly, and was gone completely within a few weeks of this hosing being carried out every day.


Tested: SDoc100 Corrosion Protectant review


Fresh steel plates were cut to size, folded at 90° (to give vertical and horizontal surfaces), then thoroughly cleaned before being coated with each product, as per the manufacturer’s guidelines. The test was carried out indoors, with a reasonably regulated temperature. For more information on how the test was done, please watch the video below.

Morning and night, the plates were each sprayed with a 5% solution of road salt in water, then consistently rinsed off at the end of each week with a hose head set to a shower pattern.

After eight weeks, the hose head was switched to a more aggressive fan spray, and the plates were rinsed with a consistent five full strokes from a distance of one inch each time.

After 14 weeks, any products that hadn’t completely corroded were hosed off every evening.


SDoc100 Corrosion Protectant stickiness test

SDoc100 Corrosion Protectant stayed slightly wet looking after application, but had no noticeable colour. After drying for 24 hours, sand dusted over the plate was retained across the whole face (as the other dedicated products). When rinsed it kept more sand than ACF-50, but a similar amount to the other protectants. When hosed with the fan (as in the rust test) all the sand was removed.



Metal plates were cut to size then thoroughly cleaned, before each product was applied as per the manufacturer’s instructions.

The plates were left indoors, laid horizontally for 24 hours, then each was dusted with fine sand. The plates were tapped vertically to knock any excess sand off, before being assessed for stickiness.

Next, each plate was rinsed with a hose head set to a shower pattern, and the amount of sand left was assessed.

Finally, each plate was hosed with five full strokes from a distance of one inch using a more aggressive fan pattern, before being checked for any remaining sand. Both rinsing cycles represent the methods used during corrosion testing.


SDoc100 Corrosion Protectant safety on rubber

After being soaked in SDoc100, our test O-ring showed no sign of deterioration in any way.

Brand new O-rings kindly supplied by motorcycle parts specialist B&C Express were put into test tubes containing each product. These were left for three months to soak, before the O-rings were carefully removed and assessed for any swelling, cracking, or other changes to their structure.

Please note that we do not recommend using these products as chain lubes – we’re just using the O-rings as a consistent material.


SDoc100 Corrosion Protectant review verdict

SDoc100 offers a reasonable level of protection against corrosion – it’s not the best product available, but it did perform better in our test than ACF-50, and used regularly (as the manufacturer recommends), it will give a very good resistance to rusting.


Group graph


The full list of products tested is as follows:

  • ACF-50
  • XCP Rust Blocker
  • Scottoiler FS 365
  • SDoc100 Corrosion Protectant
  • TechCote ACS TC200
  • Muc-Off Motorcycle Protectant
  • Original WD-40
  • GT85
  • Valvoline Multi Spray
  • Motorex Moto Protect

To read the reviews of any of these items, please click here.


Full timelapse of the test

John explains how the biggest ever corrosion test was done, and shows the entire process, from bare metal to fully corroded…

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