Wet on wet varnishing - what is it?

Automotive and industrial painting is constantly developing and many industrial paint shops carrying out wet painting services orders use many modern technologies that improve work efficiency and make the process even more accurate. Do you want to learn what wet on wet painting is? This is one of many methods, which is used primarily when painting plastics.

What is wet on wet painting?

In practice, the wet-on-wet painting method is used primarily on body elements that are new or in very good condition, or on decorative elements from various industries that require multi-layer painting. This method of painting does not include long drying and sanding the surface after applying a given layer of paint. After wet painting the first layer, we apply the next one on a given element after a short period of time, when it has not completely hardened. Various evaporation times are used between layers – sometimes just a few seconds is enough, sometimes a few minutes. It all depends on the type of varnishes and the speed of the thinners and hardeners they contain.

How to prepare a surface for wet painting?

The wet-on-wet painting method is often used in car painting plants. However, even in this case, it is crucial to properly prepare the surface before starting work. In order for the varnish to stay on the surface of the painted element, you must take care of such aspects as:

  • sanding the surface before the first layer – preferably with fine-grained sandpaper (e.g. 2500-3000),
  • degreasing – you can do it with extraction gasoline or nitro solvent (be careful, the latter is able to dissolve the varnish),
  • cleaning the surface from dust and impurities – this is the basis for wet-on-wet painting to take place without any inclusions.

Any mistakes made at the stage of preparing the surface for painting may result in unsatisfactory results of wet-on-wet painting. It is also very important that wet painting services take place in a specially prepared dust-free chamber and using professional equipment – here we are talking primarily about an appropriate painting gun and a compressor as well as a chamber with good mechanical ventilation.

Wet on wet varnishing and painting – how to do it step by step?

Painting procedures are not complicated and the entire process of renovating a given element, e.g. a car body, must begin with surface preparation. In this case, you must remove or matt the old varnish, fill any gaps, matt and degrease the element before proceeding with further work. The next steps are as follows:

  • Clean the surface of the painted element from dust and place it in a dust-free chamber.
  • Select the paint and mix the mixture, then pour it into the container of the paint gun, using an appropriate paint filter (e.g. 125 microns – these are the most popular, but sometimes others are used for thick metallic grains) to sift out any lumps,
  • Apply the first layer of varnish wet by moving slowly left and right at the right angle.
  • Wait until the thinner from the first layer of varnish evaporates, but do not let the varnish harden completely.
  • After some time (usually a few minutes in optimal conditions), you can start wet-on-wet painting the second layer.
  • Dry the applied varnish coatings or leave them to harden at room temperature – the drying and seasoning time depends on the characteristics of the product you choose. It is best to leave the components in a dust-free chamber for 24 hours. This way you will avoid the risk of dust or dirt sticking to the fresh coating.

This procedure allows you to create a durable and aesthetic paint coating on any selected parts.

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