Automotive sheet metal, how to repair primer and sheet metal glue?

What is "gluing"? We know that there is glue in many places on the car body, such as door glue, front and rear cover glue, trunk damping sealant and so on. If the car has an accident and the hood is replaced, the replaced parts usually have no original sheet metal glue, and some merchants will "manually" stick the original sheet metal glue to make the car look better. This time, let's take a brief look at this kind of sheet metal glue.

In prawn's view, cutting-edge technicians don't develop rockets, planes and artificial intelligence. Most of the "high-tech technicians" are hidden in a corner. With hard-working hands and dozens of tools, they are doing the work of the main engine factory that invests billions of assembly lines-sheet metal glue, and the appearance similarity is as high as 90%.

The difference is that the original sheet metal glue can play the role of rust prevention and sealing, while the imitation glue on the roadside is only in appearance, in order to cover up the repair marks, it can not play the role of rust prevention.

There are several common gluing methods:

First, stick masking paper on both sides that need to be glued, reserve the width of the glue, glue in the middle after gluing, and tear off the masking paper on both sides after processing. The principle is similar to that of home decoration tiles.

Don't ask prawns why they even know how to sew tiles, divination, match keys and throw sewers.

Second, the mechanic makes plastic cards with cardboard shells, bank cards and other cardboard shells, and cuts a hole in the edge of the card, and uses this hole to make sheet metal glue on the parts. The disadvantage of this process is that the sheet metal glue produced is uneven, thick in some places and thin in some places, with different lengths, which is easy to see.

Third, there are ready-made tapes (different models have different tapes), just stick them directly in the corresponding position. The length of this adhesive tape is even after sticking, which can reach 80% similarity with the original factory. The disadvantage is that some tape sellers' products are unqualified, and whether the tape is soft or hard is different from the original factory. Of course, some "reliable" sellers can also use the original factory to press the adhesive tape, as shown in Figure 65438+.

Figure 1 Tape is unpainted.

Fig. 2 After coating the adhesive tape, the adhesive tape is pasted and coated again. At this time, can you tell whether it is the original tape or the repaired tape?

Fig. 2 After pasting adhesive tape and painting.

The above three methods all have some disadvantages. The first two methods are primitive, and the rubber strips made are not uniform enough. Although the effect of the third strip is realistic, it feels bad when pressed. The society is progressing and the times are developing, and the tools for sticking sheet metal have also ushered in technological innovation. At present, the popular way is to use the glue artifact, and the shape of the sheet metal glue sealed by the door edge, front and rear covers or engine compartment can reach more than 90% similarity with the original factory. The pressing feel is basically 100% of that of the original factory. Take the internal sealant of BMW engine compartment as an example. If you are familiar with BMW shrimp powder, you should know that the original sealant of BMW engine compartment is uneven, but it is difficult for you to copy it by hand later. If you use this glue artifact, the sealant can basically be faked.