Why are plastics coated?? Coatings on plastics may be necessary for the following reasons:
1) this procedure is often cheaper than the necessary change of the color of the material;
2) manufacturing defects can be covered, like so far, streaks and stripes;
3) this increases the chemical resistance of the material;
4) coatings eliminate defects caused by the aging of the material;
5) when the customer requires a special color of the material;
6) when an inscription or a graphic mark should be made on the material.

What is the pre-treatment of a plastic substrate possible?
Pre-treatment can consist of:
1) cleaning in a bath of ammonia-containing surfactant;
2) cleaning with organic solvents;
3) flame purification (most often it concerns only polyethylene);
4) sanding down;
5) abrasion with antistatic material (in industrial conditions – also ionized air blowing). The correct one is selected from among the listed treatments, adapted to the type of material.

In the case of plastic, cleaning in a bath with an ammonia-based surfactant is often used. Please describe the process of this process
For cleaning, a bath prepared from 10 l of water with the addition of approx. 0,5 l 10% aqueous ammonia solution (Alternatively 1,25 l 10% aqueous ammonia solution) plus 2 surfactant caps. Use this mixture to clean the substrate. During this process, wet or dry grinding with abrasive fleece is also used. Finally, rinse the cleaned element with plenty of clean water. You must use rubber gloves to protect your hands.