English English Nederlands Nederlands Deutsch Deutsch Italiano Italiano Español Español Français Français 简体中文 简体中文 Português Português Русский Русский
    DetailingWiki Newsletter
    Get free and automatic updates on new articles
    We respect your privacy. No data is used for anything other than sending the newsletter!

    Advertisement

Using a rain repellent

Written by:

A rain repellent is a special product that is designed to be applied on glass. The product leaves a very hydrophobic layer on top of the glass. Water won’t be able to form any wetting, and the round beads are more easily blown off the glass.

Why use a rain repellent

A rain repellent creates a safe situation. When there is so much water on the screen that your wipers hardly do the trick anymore, the rain repellent will create a hydrophobic layer that prevents the water from creating one big sheet. Because of this, it is easier to look through the window. When driving above a certain speed the wind will actually blow those drops off the windscreen. Some people have reported saying that they hardly needed their wipers anymore. However, when wipers need to be used, it is safer to just use them. Rain repellent or not.

The effect

Effect of a rain repellent
Effect of a rain repellent

A rain repellent has a hydrophobic effect. This simply means that the water molecules pull harder on themselves then that the surface underneath pulls on them. This gives the impression that the water is being pushed away. This effect causes the water to not being able to form big sheets of water. Instead it forms individual round drops of water. These drops are more easily affected by wind because they are higher with a much smaller contact area. If the vehicle reaches a certain speed, the waterdroplets are simply blown off the surface.

Application

Application varies from product to product. But in most cases this general guide will give a good idea on the most common way of application.

  • Clean the window as best as you can
  • Polishing/claying can help you to clean the glass more thoroughly
  • Wipe the glass off with an IPA based glass cleaner
  • Apply the glass sealant either to an application pad or a MF towel
  • Apply the product to the glass. The key is to apply it evenly on the surface
  • If you put a few small dots in several places, and then go over that area criss-cross, you are more likely to get an even coverage
  • Leave the product to dry (check the label or ask your manufacturer on the recommended time)
  • Buff off the residue, in many cases this will take a fair bit of effort
  • A glass sealant doesn’t really need any maintenance, just a regular wash is enough
  • Check the finished result in different light, there might be smear that are difficult to see

Ups and downs

There are a few upsides and downsides on using a rain repellent.

  • It won’t fix worn wipers
  • It can make the wipers skip a bit
  • The drops of water can dry up and leave little round spots of sand/dust
  • Not everybody likes the look of raindrops flying over the windscreen
  • Application can sometimes require a fair bit of effort (product dependent)
  • The cheaper sealant will only last months, the more expensive coatings can last years
  • Cleaning thoroughly can have a big effect on performance
  • In very rare cases people have reported seeing a very slight funhouse-mirror effect (others couldn’t replicate it)
  • The product can have a negative effect on the MF towel used, it’s best to use an old MF towel
  • Certain product are known to dissolve foam applicator pads

Different related articles

  • The best sealant
    Detailing Miscellaneous
    It is often asked on detailing fora and social media: "what is the best sealant". Off course there is a difference between certain products and brands, but it is important to know what you are asking. In this guide I will try to explain what the problem is with this question unless it is asked more in-depth....
  • Valma
    Manufacturers
    Valma is brand that originates from around the 1930's and is still available in several shops. The can be recognized by their logo that hasn't changed much in the last 80+ years....
  • How to combine dressing and coating
    Detailing Miscellaneous
    Not all coatings have enough effect on the oxidized look of UV-damaged plastic. Most dressing restore the look better, but don't offer the protection of a coating. Combining these 2 seems illogical and difficult, but it isn't....
  • Crankalicious
    Manufacturers
    Crankalicious is a brand of detailing products specifically aimed at the world of bicycles. The products they offer are designed with the materials and maintenance for a bike. The is located in Essex, United Kingdom and is a part of Dodo Juice....
  • What is claylube
    Decontaminating
    Claylube is a specific liquid that helps to lubricate the surface when claying. Without this lube, the clay will leave a lot of marring due to it being fairly rough and having a very high level of friction when moving....
  • Engine bay cleaning – basic
    Detailing Miscellaneous
    The engine bay is an important part of the car, and many detailer want it looking like it is brand new, or even better: custom build. This means cleaning of a lot of dirt, grime and oils that are hard to remove. This basic guide will give you some pointers before you start....

Links to this article

There are no external links to this article. Yet.
Sidebar



Stay up to date with our free newsletter
Always be the first to know about new updates, articles and other informative content.
Don't miss out, opt in!
We respect your privacy. No data is used for anything other than sending the newsletter!