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Koch Chemie Finish Spray Exterior: Real World Test And Review

I bought and tested Koch Chemie Finish Spray Exterior. It’s an exterior quick detailer designed to quickly clean and shine exterior surfaces and it works. I gave it a 8.3 out of 10 overall in my real world test.

I actually use Koch Chemie Finish Spray Exterior in my business half the year so I feel like I know this product well. I’ve some details of a few special use cases of this product in this article that may be of interest to you.

I tested Koch Chemie Finish Spray Exterior against my usual criteria to see how it performed against other quick detailers.

Read on to hear how see how it performed.

Prepmycar Rating: 8.3 / 10

Koch Chemistry Design Finish Spray Exterior (FSE) – Quick Detailer with Chalk Paint Remover 1 L …

Koch Chemie Finish Spray Exterior

  • 9.0 Ease of application
  • 8.5 Cleaning ability
  • 9.0 Aesthetics
  • 6.0 Durability
  • 7.5 Hydrophobicity
  • 9.0 Value for money
  • 8.2 OVERALL TEST SCORE

Pros

  • Easy to apply
  • Effective as a water spot remover and dirt remover
  • Improve the look of paint and also improve the appearance of exterior

Cons

  • Low Durability

Quick Summary

Koch Chemie Finish Spray Exterior is frequently used as a water spot remover, its chemical makeup dissolves the lime deposits that cause unsightly watermarks – it performs excellently here.

On the other hand, compared to other quick detailers, Koch Chemie Finish Spray Exterior lacked in the durability department.

Your may be interested to hear that Koch Chemie Finish Spray Exterior not only works well on paint but can be used to clean glass and exterior plastics. It improves the gloss of paint and provides a layer of protection from the elements.

Testing process

In the summer months, I usually bring Koch Chemie Finish Spray Exterior with me on every detail as a water spot remover.

Despite how quickly I try to dry the vehicle, on the hottest days water spots still form. In that regard I have plenty of testing experience using Koch Chemie Finish Spray Exterior as a water spot remover.

I carried out testing on my own vehicle to examine the ability of Koch Chemie Finish Spray Exterior to safely remove moderate dirt. I also examined the hydrophobicity of the product after application, and at regular wash intervals to test the durability. 

I’m used to using Koch Chemie Finish Spray Exterior on hot sunny days but on the day I carried out the cleaning test, temperatures were around 10°C, with intermittent cloud. 

Test Results

Ease of application (9.0/10)

Koch Chemie Finish Spray Exterior is usually sold in a one litre bottle without a trigger head, so this will need to be purchased separately. With a quality trigger head the product is easy to use. For removal of water spots, I sprayed one pump onto the affected area and gently wiped with a microfibre towel. 

When cleaning the dirty panel on my car, I sprayed several pumps on the panel to ensure as much lubrication as possible was present.

I also sprayed Koch Chemie Finish Spray Exterior on the microfibre towel to ensure as much lubrication as possible was present between the cloth and my paint.

I used light pressure and drew the cloth in one direction before flipping the cloth and wiping another section. I did not use circular motions, as I wanted to minimise the risk of inflicting swirl marks. 

In order to test the durability of Koch Chemie Finish Spray Exterior, I washed my car using a strip wash method. I used a traffic film remover, before using Meguiar’s Wash Plus shampoo to remove any previous waxes on the paint, that might have impacted the results.

With the paint dry, I sprayed a few pumps onto a clean cloth and spread it over a panel, before flipping the cloth and lightly buffing to a high shine. Koch Chemie Finish Spray Exterior is not streaky, and I have found it easy to use in varying weather conditions, including warm direct sunlight. 

Cleaning ability (8.5/10)

Koch Chemie Finish Spray Exterior is known to many as a water spot remover.

What makes it so effective as a water spot remover is that it is acidic in nature. Water spots are typically alkaline due to the presence of lime.

The acid composition of Koch Chemie Finish Spray Exterior neutralises the lime and makes the water spot easy to remove.

On the back of this, Koch Chemie Finish Spray Exterior may degrade existing coatings with regular use, which is something worth bearing in mind.

I have found Koch Chemie Finish Spray Exterior to be the most effective way to quickly remove water spots. It is important to tend to these quickly as if left too long can begin to etch the paint. 

Koch Chemie Finish Spray Exterior effectively removed the dirt on the side of my car and also left behind a nice gloss. I inspected the paint under a direct light source to determine whether swirl marks had been inflicted. I did not notice any. It is worth noting that after stripping the Koch Chemie Finish Spray Exterior from the paint, I noticed some marring at certain angles. It was hard to notice but serves as a reminder to always use safe wash methods were possible. 

Aesthetics (9.0/10)

I was pleasantly surprised by just how much the gloss levels on the paint were improved. Not only did it improve the look of paint, but it also improved the appearance of exterior plastics. 

Durability (6.0/10)

Koch Chemie Finish Spray Exterior is not intended to be a long-term paint protection solution. The durability is not as good compared to many other quick detailers. Users can expect a month or so durability, or between one and three washes. As with any protection product, preparation is key to extended durability. Regular updates to the performance will included below:

Hydrophobicity (7.5/10)

After spraying Koch Chemie Finish Spray Exterior on the panel, I sprayed water onto the panel to examine the water behaviour. I noticed the water quickly beaded when it came in contact with the paint. Sheeting was not as impressive as other quick detailers I have used, with the water taking a few seconds to run off the paint.  

Value for money (9.0/10)

Koch Chemie Finish Spray Exterior is sold in 1 litre bottles for around £10.00 ($11.19 USD) from many UK retailers. This makes it one of the best quick detailers in terms of value for money. A spray from most trigger heads is around 1 ml, so this one litre bottle will be able to remove up to 1000 water spots. 

Specialist Features

As mentioned, the main selling point of Koch Chemie Finish Spray Exterior is the ability to remove water spots, due to the chemical nature of the product. It is also excellent at removing streaks on glass and plastics. 

Koch Chemie

Koch Chemie is a German manufacture of detailing and industrial cleaning products founded in 1968. They have a broad range of detailing products, with some products being highly specialised. They also manufacture automotive compounds and polishes, which are among the top performing compounds on the market. They carry out their own in-house research to ensure their products give the best performance possible. 

Final thoughts

Koch Chemie is a product I think every detailer will find a use for. I think it is economical enough to have as a stand-alone water spot remover, and it is for this purpose that I use Koch Chemie Finish Spray Exterior.

It does not compete with other quick detailers on the market in terms of hydrophobicity and durability, and it is worth remembering that Koch Chemie Finish Spray Exterior could degrade waxes over time. 

FAQ

What are some uses for Koch Chemie FSE?

FSE is primarily used to remove water spots from paint which can form on warm days after washing the vehicle. It can also be used to quickly add gloss to paintwork and clean glass.

Can Koch Chemie FSE be diluted?

Koch Chemie is sold ready to use so does not need to be diluted, it can be sprayed directly onto paintwork or onto a cloth.

Is Koch Chemie FSE sold with a trigger head?

Typically, it is not, but it is worth checking the seller’s description to see if one is included. If not, trigger heads can be picked up relatively cheaply.

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Koch Chemistry Design Finish Spray Exterior (FSE) – Quick Detailer with Chalk Paint Remover 1 L …
513 Reviews
Koch Chemistry Design Finish Spray Exterior (FSE) – Quick Detailer with Chalk Paint Remover 1 L …
  • Koch Chemie Finish Spray Exterior is an all-round quick detailing spray with limescale remover, suitable for use on paintwork, glass and plastics....
  • Finish Spray Exterior cleans, maintains and preserves in one step leaving a slick and streak free, high gloss finish.
  • Built in limescale remover
Jonathan

Jonathan

Jonathan has been a car fanatic since his dad got him hooked on the Ferrari F40. Whilst he has dreams of owning one someday, he's poured his life into being the best he can be when it comes to detailing. Whilst car detailing is just a hobby, the countless hours and money invested makes him a unique addition to the detailing industry, offering unbiased opinions and methods that often go against the trends.

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