Stages of repair and proper painting of car thresholds on your own
The thresholds of the car are structurally located close to the road, which responds to them with serious loads - the paint is chipped off by frequent impacts of stones, the coating is damaged by road chemicals and dirt. In conditions of high humidity, damaged metal begins to rust. If the problem is not corrected in time, this body part can be corroded through to the point where it is easier to replace than to repair. The owner of the car needs to monitor the condition of the thresholds, if necessary, to carry out work on their restoration, processing, after which you can paint the thresholds yourself.
Restoration of the threshold by straightening
If the damage is relatively small, straightening repair is possible. However, with strong defects, rotten metal through and through, it will be quite justified to simply replace the body element before painting. After inspecting the car, a professional bodybuilder will almost immediately determine whether it makes sense to tinker with repairs or if the threshold should be replaced. If the work is done by hand, you should compare the labor costs for restoring the thresholds, along with subsequent painting, with their cost and decide what actions to take.
As a rule, the threshold is one with the car body, although sometimes it is made removable. Straightening can be carried out from the outside, while in places of dents special hooks are welded to the metal of the body element, for which the working part of the spotter is attached. It is a specialized tool for leveling recesses in metal. When repairing thresholds, damaged areas can be cut out and a patch welded in their place. Irregularities, joints and seams are subsequently smoothed out with putty.
If external repair is not possible, the seats, doors, seals and other elements that may prevent access to the part from the inside are removed. After that, the thresholds are straightened from the side of the cabin.
A removable element provides clear advantages in the event of its repair, because it can be unscrewed from the body, straightened, prepared and painted separately from the car. Upon completion of straightening, preparations for painting begin.
It makes sense to putty thresholds only on pre-prepared metal. A carefully cleaned and degreased surface with your own hands is an excellent basis for applying putty. Work on an unprepared part guarantees rapid delamination and poor fit of the filler. It is unlikely that there will be a point in filling the threshold directly on the paint or the primary primer.
It is necessary to add a hardener to the composition shortly before use. The preparation time of the working mixture should be approximately one minute, and the mass of the hardener should be within 2-4% of the mass of the entire composition.
At the same time, 5–7 minutes are allotted for processing the auto part, after which the process of solidification of the composition will begin and it will be useless to do anything with it. The putty is applied in portions, in thin layers, with stops for 5-10 minutes to dry. By pressing a spatula on the composition, they achieve the removal of excess air from the mass.
In the room where the car is puttying on its own, a certain temperature and humidity must be observed. If the moisture level exceeds the set level, the mixture will not completely harden, and at high temperatures the setting will occur too quickly. When using putty with fiberglass, it must be borne in mind that its pores are difficult to cover with soil. In this case, you should use a liquid putty for finishing. After the putty has dried, before painting, the thresholds are sanded by hand or with a grinder.
The point of priming a car body part before painting it is to create conditions under which the paint adheres better and the metal is protected from corrosion. The soil also clogs small pores. If you need to carry out the primer yourself, the sequence of actions is as follows:
- the working surface of the car is degreased;
- closely spaced parts are covered with a newspaper or cape to avoid accidental painting;
- the soil is diluted with a solvent (it is advisable to use the original one, but 647 is also possible);
- the mixture is sprayed onto the car part (several times if necessary);
- grinding is performed;
- areas of complex shape are processed with scotch-brite.
It should be noted that a good option would be if the color of the primer matches the color of the paint, and gray primer is considered universal.
Body painting and varnishing
Do-it-yourself painting of a part, in a particular case, the threshold of a car, is carried out in several approaches. If the color of the primer differs sharply from the color of the paint, it makes sense to paint the part with more layers. The paint is applied to the part from a distance of 20–25 cm. Before the next approach, the previous layer is dried for 3–7 minutes.
The final step in the repair of thresholds is varnishing. The varnish protects the paint, the surface of the car body and adds shine. Do-it-yourself varnishing involves several steps, namely:
- The varnish is diluted according to the instructions.
- The mixture is applied to the surface of the car part in two layers, while before applying the second layer, you should take a break to dry the first.
- As a third layer, apply a composition consisting of a mixture of the previous layer and a solvent in a 1:1 ratio.
- Places of transition from the restored surface to other parts of the car body are treated with an even more diluted composition.
- A clean solvent is applied to the transition area.
- The body is dried for 2-3 days.
- The surface is ground and polished to give smoothness and shine.
As a part subject to regular damage, the threshold needs periodic minor repairs and painting. It is relatively easy to paint it with your own hands, if everything is not clear in the instructions, you can watch the corresponding video. The main thing is to act carefully, consistently and not to allow negligence when painting.