Colour charts

The colour charts are given as an indication, the resolution of your screen and the printing quality of your printer can significantly alter the exact reproduction of the colour.










What is a paint?

A paint (or a varnish) is a fluid preparation that can be spread in thin layers on all kinds of materials (called substrates) to form, after drying or reticulation (hardening), a thin coating (film), adhering and resistant, playing a protective and/or decorative role.

The paint is made up of the following elements:

- Binder/resin: gives the film quality (epoxy, polyurethane, acrylic, alkyd, etc.).

- Pigment: powder or paste; provides colour and/or anti-corrosive / hardness, appearance.

- Fillers: mica, talc, mineral element/powder; hardness, opacity; complementary with pigment.

- Solvent: water/solvent (ester, aliphatic, aromatic, petrol): drying and hardness quality (heavy, light, etc).


- Additives: each provides a particular quality (wetting agents, surfactants, corrosion inhibitors, anti-bubbles, structuring agents, etc).

What is corrosion?

Corrosion is a major problem for all industries.

It is estimated that 5 tons of steel are lost every second worldwide, the equivalent of 2 Eiffel Towers every hour.

Corrosion affects all metals, with deterioration occurring on contact with water and air.

To protect against corrosion, it is necessary to isolate the part from its environment (which brings water and air) by an effective barrier: a thick and adherent paint film.


Bouchillou Alkya offers a range of paints that can effectively and economically address the problems of corrosion with its range of primers, finishes and single coats.

Safety and biodiversity

In a rapidly changing industry, Bouchillou Alkya is keeping up with the latest standards, legislation and technological innovations. This leads us to reinforce our requirements in the design and formulation phases of our products, and to apply a long-term vision to protect the environment.


With the development of water-based paints and a range of aromatic hydrocarbon-free products, Bouchillou Alkya is helping to improve best practice in its business.

Defects and solutions observed during application

During the manual or pneumatic application of your paint, defects may occur due to various factors. Bouchillou Alkya presents you with the causes and solutions to these problems. Do not hesitate to contact our technical services, as the list presented is not exhaustive.

Orange peel

Causes: Lack of dilution, diluent too light, too much product flow, low pressure reducing atomisation or wrong application distance.


Solutions:  Allow the primer to dry well, use heavier thinners, adjust the flow/air/spray ratio of the gun and increase the dilution and application distance.



Causes: Wrong thinner, too thick layers or incompatible undercoats.

Solutions: Allow undercoats to dry and observe the recommended thicknesses.


Causes: Thinner too heavy, temperature too low, low viscosity or excess product.

Solutions: Increase the viscosity of the application, adjust the evaporation time between coats, adjust the flow/air/product ratio, temper the product and use lighter thinners.


Air bubbles

Causes: Presence of moisture in the application equipment, paint agitation and water condensation on the surface.

Solutions: purge the application circuits, be vigilant about the humidity level, let the paint rest to degas and use the recommended solvents.



Causes: Air contamination or presence of pollutants (silicones, greases, etc.) in the application equipment, inadequate degreasing.

Solutions: Clean the substrate with a suitable degreaser or with anti silicones and clean the application equipment.



Paint particles arriving dry on the substrate and disrupting the appearance of the film (matting zone) Causes: Thinners that are too weak, high viscosity or inappropriate application equipment settings.

Solutions:  Add a slower thinner, increase paint flow, adjust application equipment and adjust paint viscosity.


Causes: Coats too thick, poor paint preparation or undercoats not dry.

Solutions: Respect the thicknesses and drying times and prepare the paint in an appropriate manner in accordance with the recommendations of the Data sheet.


Causes: Incorrect mixing, undercoats not dry enough or wrong thickness of undercoats.

Solutions: Apply evenly, respect thickness and drying times and prepare the paint properly.

Lack of adhesion

Causes: Poor surface preparation or poor substrate condition.

Solutions: Surface preparation: clean and sand or use a better paint system.


Water stains

Causes: Substrate in contact with humid air or water splashes.

Solutions: Respect the drying times before applying the paint outdoors or use a faster hardener or drier.

Lack of opacifying power

Causes: Too much dilution or insufficient thickness.

Solutions: Use a suitable undercoat colour, see Data sheet regarding paint thinning and thickness.



Pigment separation

Causes: Too much dilution or too thick.

Solutions: See Data sheet on dilution and paint thickness.