Tested: Scottoiler FS 365 corrosion protectant review

Tested: Scottoiler FS 365 corrosion protectant review


Date tested: April 2018 | Price: £8.99 for 1litre, £34.99 for 5litres| www.scottoiler.com


Scottoiler FS 365 is a water-based product designed to be sprayed on after every ride. It’s extremely easy to apply using the pump trigger on the bottle, and washes off quickly when cleaning. It should be kept away from tyres and brakes, but can be removed simply with a hose.

Because it’s so easy to wash off, it’s important to read the instructions, which clearly state it should be applied after each trip; because it’s so quick and easy to use, this isn’t a problem, but some other reviewers have expected FS 365 to perform in the same way as thicker products like ACF-50 and XCP Rust Blocker; it won’t.

While FS 365 does wash away easily, it also pools and builds up in the nooks and crannies of your bike, particularly in the areas you can’t see, which might not get washed properly and can corrode before you realise; the more FS 365 builds up, the more resilient it becomes, but it will always be removed by a direct jet of water.


Scottoiler FS 365 performance

Unsurprisingly, when applied just once, the plate coated with FS 365 started to show significant corrosion after just a week.

The second Scottoiler test plate had the product reapplied only after each evening spray of 5% road salt solution (not the morning one), to simulate a more typical commuting scenario that would have application of the product when getting home. In this case, the results were excellent up to ten weeks, the plate staying spotless, despite being gently rinsed at the end of every week (giving it a chance to build up).

Once the hose was switched to a more aggressive spray pattern for those weekly rinses, the protection degraded – while FS 365 can build up and protect metal surfaces from light water, anything stronger sees it stripped off entirely, so the rust was able to take hold between applications in our test.


Tested: Scottoiler FS 365 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.


Scottoiler FS 365 stickiness test

Thicker areas stayed wet looking, having a green/blue tint. After drying for 24 hours and being dusted with sand, a fair amount stayed on, with more in the areas where it had pooled. Rinsing removed all the sand, though as expected, it did also take the product with it, leaving the plate unprotected.



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.


Scottoiler FS 365 safety on rubber

FS 365 was completely safe in our test with O-rings, causing no deformation or swelling.

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.


Scottoiler FS 365 review verdict

Used correctly, FS 365 can give very good results, but you must spray it on thoroughly, and you must do it after every ride. Of course, almost any product sprayed on after every ride will give superb results, but Scottoiler’s advantage is in its ease of application – just pump it over before putting the bike away.

Some riders use FS 365 to compliment a more hard-wearing corrosion protectant, but if you’re fastidious in your application, it can protect your bike. If you’re commuting in the worst weather, you’d need to keep a bottle at work too, but really, we suggest a harder-wearing product for these harsher environments. For riders who use their bikes less regularly, FS 365 can be an easy way to keep your machine looking good.


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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