Formation of film in the appearance of orange peel on the surface where paint is applied.
Reason: Application surface is grift or surface tension is low, spray gun is put close to the surface or solvent evaporates quickly.
Solution: Sand the oranging surface and paint again.
Spilling and hanging occur with the formation of an uneven film in the form of spilt paint on vertical or curved surfaces.
Reason: Very thick paint is applied at one time on vertical and curved surfaces; application viscosity of paint is very low, paint gun is held at various angles different from a steep angle to the surface or in different ways, so paint accumulates at one point.
Solution: Regard the paint or varnish viscosity; apply in thin coats, especially on vertical surfaces; distance between paint gun and surface should be 20 cm for normal operations and 30 cm for high pressed operations.
Formation of surface defects like pinheads on surfaces where paint is applied.
Reason: Unsuitable thinner is used, very thick application is carried out in hot weather, second coat is applied before waiting for the sufficient drying time of first coat application.
Solution: Decrease film thickness and viscosity and conveyor speed, and paint should be brought to a form suitable for line conditions.
Lifting is the situation where the paint at the bottom lifts off.
Reason: Lifting occurs generally when the solvent content of top coat paint is higher than the bottom coat and solvent of top coat paint causes the paint at the bottom to lift off.
Solution:Sand the damaged surface again and one more paint application should be applied on this area.
Openings and collapses in the form of crater on surfaces where paint is applied.
Reason:There are dirt or tiny foreign bodies on the painted surface, paint is contaminated with the surface active materials or surface tension of the paint is very high.
Solution:Slightly sand the surface and clean with non-polar solvents. Surface tension of the paint can be decreased by adding silicone oil or other surface active materials. Viscosity can be increased.
Paint falls to the surface as powder.
Reason: Unsuitable application such as spray gun distance, very high paint viscosity or use of improper thinner.
Solution:Use the proper thinner stated in the technical bulletin and viscosity arrangement should be performed properly.
Weakness of paint to adhere on application surface.
Reason:Surface is not cleared of oil and dirt sufficiently, over cured first coat or insufficiently cured subsequent coat is applied.
Solution:Remove the oil with solvent in order to achieve a surface cleared of oil and dirt, slightly sanding the primer coat enhances adherence.
Inability to obtain the desired glossiness and vividness on a surface after smooth and well spread top coat paint film is applied.
Reason: Top coat paint is applied without waiting for the primer to dry, paint is prepared incorrectly or unsuitable thinner is used.
Solution:• Apply the recommended primer, thinner and hardeners in accordance with the stated application techniques and adhere to the stated drying times between coats. Ensure that paint environment is dry and warm.
It means very slow drying of paint film and inability to achieve the required hardness.
Reason.Solvent leaves paint very lately when highly cold, moist and unsuitable weather conditions are present, recommended waiting time between coats is not adhere to or an unsuitable thinner is used.
Solution: Ensure you are working the correct ambient temperatures, check instructions, stick to the recommended waiting time between coats and apply each coat as a thin layer. Use the thinners recommended by the manufacturer at the recommended ratios.