Truth Or Myth?

I was told about a ‘scratch hack’ many years ago that removes light scratches from car paintwork, within seconds and cost virtually nothing. Sounds to good to be true right? I’m talking about the trade (no so) secret of the commonly used product WD40. I often wondered if it was true but never had a reason to find out. If I had a problem with paint, I would correct and protect it properly.

A little about WD40 first.

I was first developed around the early 1950s by Rocket Chemicals based in California who later changed their name on the basis of their product. The name WD40 stands for Water Displacement 40(th formula). The actual formula is a trade secret and only been held in secure vault in San Diego California since 2018. The product has not been patented to this day, to do so the ingredients would have to be disclosed. So if you want to copy it you could, if you try and reverse engineered like many others have and call it a different name.

The actual product hasn’t been changed for many, many years. The product was initially developed for a company to protect the outer skins of a super delicate skin of a ballistic missile from rust and corrosion. It later went on to find a host of household uses such as lubrication, protection and cleaning when it became commercially available in the very late 1950s. I won’t go into that side of it, you only have to look at YouTube or TikTok for various household hacks, from removing sticky labels, worktops, hinges, freeing up bolts etc.

I just want to look at this product from a car detailing point of view. It can be sprayed under the car to freshen things up, stop squeaks, apply a coating prior to winter to stop door rubbers sticking, short term storage or just polish up a bit. There are other products out there can do these dedicated tasks better than WD40, but not all of them together like this versatile ‘Jack of all trades’ product can.

Now of course there will be pros and cons for this ‘hack’;


  • Cheap, cost of a cup of coffee
  • Quick to use
  • Instant results
  • Looks OK
  • Disguises light scratches
  • Forms a protection barrier
  • Can prevent rusting
  • Long shelf life


  • Temporary fix
  • Only light scratches disguised
  • Body shops hate it
  • Often used to make cars look better than they actually are
  • Can be messy
  • Oil based
  • It can mess detailing pads up

The fact is that if you are spraying WD40 on anything, you are spraying an oil based type of product. Like I said in the cons, it’s only a quick fix and the old scenario of the car lot salesman showing you a gleaming car gives this hack a bad name.

The opportunity I had to try this hack out was that I had to remove a couple or stuck on hard plastic sill protectors on a car. Once they were removed it had left a couple of light scratches on the paint, even with my gentle panel removal tools. They are difficult to see but they are there.

So the tip so simple; spray a little on the paint and wipe over. Nothing could be easier, you don’t even have to rub it in just spread it about a bit.

The result is a miraculous cover up so the exposed paint could be seen again without the scratches.

So, does it work then? Yes – sort of

On the deeper scratches it improves it, but it doesn’t wipe them out. On lighter scratches does.

How? It’s all down the way light is reflected from the paint. The oil settles into the scratch and makes the light ray dispersion more uniform thus it disguises the scratch or swirl. This is a similar principle to car paint glaze which is a more durable option which needs a wax to protect it. I explain this paint defect principle in much more detail here. or cut and past this to your browser: htts://

The general rule of thumb is if you can feel the scratch with your finger nail, you have a problem. If you can’t feel the scratch then it can be buffed, glazed or hidden in one way or another.

As the WD40 is oil it will eventually disappear due to the elements if on an exposed area. If the product is rained on a lot, it will need regular applications. So, if you want to mask or ‘hide’ a light paint surface imperfection, then you could use this product on a temporary basis. If you are going to buy a car, gently feel the paint to see if there is a oily film to the surface.

Another down side is that dust can settle in the WD40 spray and stick to it, so wiping it away could introduce more problems. The reason body shops don’t like it is the fact it’s oil based and once on your hands can be transferred all over the workshop. To clean it up properly in order to spray paint anything properly, this makes it all the more time consuming.

I tend to carry a small ‘sample’ sized can for a couple of reasons;

If you get a stone chip and can’t get to fix it for a while, spray the area with the WD40 and it will form a temporary barrier until you can fully remove it later to fix the chip.

If you are suffering from damp in your distributor cap (back to old school cars now) or HT leads etc, you can spray this to disperse the water. After all that was it’s sole purpose for development.

Did you know?

To get those super smoky burnouts in Hollywood films easily, they used an application of WD40 on the tyres! Not that you should ever do that of course, as it could be frowned upon by the local law enforcement agencies. 😉

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That’s The Ticket

Last Sunday was another sunny day and I was raring to go, the drinks and lunch were packed in no time and the ticket to get in was printed out the night before. Once in the garage I put all my day’s supplies on the slide top tool cart. I put Hedingham Castle waypoint into the satnav and put the cool bag in the trunk. I got in, placed the satnav on the centre console, put my sun glasses on and reversed out. The satnav journey was adjusted for ‘A’ roads not the country backroads that I knew were tight and were going to be very dusty, that would make the journey around six minutes longer. I didn’t care to be honest as I was already enjoying the drive. I was just cruising along without a care in the world until I saw the signs for the castle, and thought to myself best I get the ticket on the dash in order to get in. Nope, I had left it on the tool cart back home in the garage. This could now turn out to be just under an hour drive there for nothing, then the drive back home. Nobody was directing the traffic in with a few from this side of the road then a few from that side etc. it was a free for all. However – we are civilised drivers in classic cars and some were letting others in. I pulled into the entrance gate and there was the slowly moving queue to get in. I frantically looked through my phone to look for the email confirmation I was sent. I eventually found it with the poor signal slowing things up considerably. At the check point the lovely lady marshal asked where the display ticket was. I had explain what had happened and showed her the email. She was great and pointed me to the area to park up.

Hedingham Castle is just outside Colchester in Essex. The castle was built in the 11th Century, so it’s old!

I managed to get a look around the grounds before the main public was allowed in. I don’t know why, but I really like this picture of the row boat tucked under a tree. The mini castle was for the resident ducks that lived on the two tiered lakes.

I was parked up on the lower field this time as I wasn’t part of a car club and had a little glimpse of the castle through the foliage.

I took a walk around the lower field.

Perhaps my favourite ‘Modern Classic’ the mighty Audi Quattro.

Walking up towards the castle the steep driveway cars were parked on the left and right where I was parked last year when it rained all day.

Near the top is a main house which had this amazing steam car parked outside with a diagram of how it worked.

Parked in a little area under just before the bridge was some military vehicles which grabbed some attention throughout the day.

On the upper fields there were the car clubs around the outside.

Around the back of the castle was a bigger open area where more cars were lined up in no particular order.

This camper had an awesome roof rack, From the movie Gladiator, Maximus Decimus Meridius; “Are you not entertained?”

There was some rather tiny little cars that were proving popular.

The we had some red rockets, from Japan the epic NSX, Europe’s Lancia which became the main rival to the Audi Quattro in rallying and some muscle from the USA.

The other side of the castle had some more military vehicles.

After my return back to the car I started speaking to some lovely couples and we chatted the afternoon away. Wonderful people who owned these vehicles, it made for such a nice day.

Not forgettin’ mine which was parked next to that beautiful Cortina 1600E.

Throughout the day I let a few people sit in my car, and a family from Dearborn spent some time chatting to me. thanks to all those that stopped by, I was on verge of losing my voice I was talking so much. Some would say that’s no bad thing though! 🤦‍♂️

The journey home was awesome, I left about an hour early to avoid the busy leaving time and enjoyed a beautiful ride home. A great day out here when the weather is nice, slightly overcast and warm with some great people too.

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Americana (last) Car Show of 2021.

This show was held at Stonham Barns organised by the Knuckle Busters Car Club on the 19/9/2021. This particular car show was for American cars only and is usually well supported and this time around that was no exception. I arrived early and I was asked if I wanted to attend in the centre ring. Why not? Early bird gets the worm and all that. I parked up next to some stunning cars which made my car look like a Matchbox or Dinky toy!

I parked next to a massive Buick that could only be described as a ‘land barge’, such a nice car it was too. Me and the owner sat in our chairs and chatted most of the afternoon.

I decided to have a wonder round and take the pictures before the public came in.

I thought I would batch the Mustangs together here, but there wasn’t as many as I thought there would have been.

A car I had seen a couple of shows earlier, but I couldn’t get that close to before. Another iconic car from Ford – the Torino. I wanted that car so bad as a little boy. My nan even knitted me a Starsky jumper. Thinking about it; I still want one!