Instructions on how to mix PU paint

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Instructions on how to mix PU paint

1. Application of PU paint

PU paint is often used as a coating for interior and exterior surfaces such as: ferrous and non-ferrous metals, wood, plastic, plastered walls, concrete, primer....

2. Instructions for mixing PU paint

When applying with PU paint, you should equip and use yourself with various types of labor protection such as gloves, protective clothing, masks, eyeglasses,... Then follow these steps:

2.1 Prepare tools

  • To mix PU paint, you need to prepare:
  • Brush
  • Roller
  • Airless or gasless spray gun.

2.2 Mixing PU paint

To blend you will need 9 parts PU Base (BASE) to 1 part PU Hardener by volume.

Then proceed to mix as follows: Stir the Base (BASE) and while stirring slowly add the Hardener and continue stirring until a homogeneous mixture is obtained.

Dilution should be performed only after the Base and Curing Agent have been mixed.

2.3 Dilution of PU paint

To dilute PU paint, you can use industrial paint thinner. With each type of instrument you will have a separate dilution ratio:

  • Brush and roller: Dilute up to 10%
  • Airless spray: Dilute up to 25%
  • Airless spray: Dilute up to 5%

3. Technical instructions for painting PU on wooden furniture

Step 1: Sanding and surface treatment

This is an important step to help the next primer have better adhesion.

Step 2: Primer time 1

This is a colorless paint, so it should be mixed in a ratio of 2:1 (2 PU with 1 hard). This ratio can be adjusted depending on environmental conditions.

Step 3: Primer 2nd time

After the first step of primer (siller) must be sanded, filled with defects carefully and sprayed a second time

Step 4: Spray color

After completing the primer steps, this is the step to mix the paint color suitable for the type of wood you want to polish and spray paint on the wood.

Step 5: Spray surface gloss (top coat)

Depending on the paint model, we choose the appropriate paint gloss. There are many grades of paint gloss from the most opaque being 10%, up to 20%, 50%, 70% and 100%. It is necessary to consider environmental conditions as well as weather to add or reduce additives to slow down the evaporation rate.

Step 6: Preservation and packaging

This step is also very important, after applying the polish, you need to have a dust-free place to wait for the paint to dry. If there is dirt on it, it will make the paint color not beautiful. Total drying time is about 12-16 hours.

4. Important attention to quality, safety and environment

To ensure the factors of quality, safety and environment, the following points should be paid attention to:

  • Paint components must be mixed properly otherwise the textures and essences will not blend together and will not produce a paint product for proper application.
  • The color mixing depends on the color sample as well as the type of wood being used. Choosing the right PU paint color palette and mixing it at the right rate will help you save a lot of construction costs and time.
  • Paint room conditions are strictly required, no dust, especially with high-gloss paints. In hot weather, the rapid evaporation will cause the paint surface to swell or worse, bubble, which will take a lot of work to repair.
  • Need to pay attention to wood material when painting PU: When making powder, it is also necessary to pay attention to whether the paint sample is required to show wood grain lines or not.
  • The application of pulp is necessary to fill in the heartwood as well as surface defects. Failure to do this step will take a lot of effort and materials to fill these gaps after painting.
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