How To Spray Varnish To Achieve A Smooth Mirror Surface?

How to spray varnish to achieve a smooth mirror surface?

1. The reason for the matt spraying is that the thickness of the sprayed paint is not enough. You need to continue spraying a little thicker to achieve a mirror effect. If you continue to spray thicker when the mirror effect has already appeared, sagging will occur, which needs to be avoided.

2. How to understand the effect of spray paint?

 

There is very little spray, only pitting, dot-like distribution on the spray parts. Spray more and it can be connected into one piece. There is more paint, and the paint between dots can stick together and initially form flakes. But it is too thin, and as soon as it covers the sprayed parts, the oily shiny substance of the paint itself is completely used to adhere to the surface of the sprayed parts, resulting in a matte appearance. On top of the effect of the previous stage, spray a little more and increase the thickness to form a mirror effect. The formation of this mirror effect is that the paint is completely connected to each other and can completely cover the surface of the sprayed part. This layer of paint is called the inner layer of paint.

 

A separate layer of paint is formed on the outside of the inner layer of paint, completely isolated from the surface of the sprayed part. The paint of this layer of paint is closely connected with the paint, and all the unique bright substances inside do not need to be used for other purposes, but are completely used for their own luminescence. Therefore, a mirror surface can be formed. On the basis of the mirror effect, if you continue to spray more, the undesirable phenomenon of tears or sagging will occur.
The sagging phenomenon occurs because the thickness of the sprayed paint is too large, and the weight of the paint itself is greater than the bond between the paint and the paint.

3. How to achieve mirror effect?
First, understand the thickness of the paint surface. What determines it?
Factors such as spray paint pressure, paint concentration, speed of spray gun movement, distance between spray gun and spray parts, air flow, paint flow, nozzle size, mist shape and other factors are all directly or inversely proportional to the thickness of the paint surface. The factors mentioned above are factors included in relatively authentic paint spraying using a standard external air pressure spray gun. If you just use a self-spraying spray gun with a portable can, you don’t need to consider so many factors. For each of the factors mentioned above, you use a three-group comparison method to find a relatively optimal control amount. After that, based on this relatively optimal control amount, fine-tune it up and down again and conduct three groups of test sprays again. From the three sets of sample effects of the second test spray, the optimal control amount of this factor can basically be found. Under the condition that the control amount of this factor has been adjusted to a certain level, then each other factor is analyzed one by one, and three groups of test results are compared according to the above method. And the optimal control amount of this factor can be found.

Take the moving speed of the spray gun as an example!
Get a test panel that can spray three groups without interfering with each other. First use a slower speed and try to spray the first group at the top. The test spray speed of the second group was a little faster than the previous group. The test spray speed of the third group is a little faster than that of the second group. In this way, the paint effect sprayed by the spray gun at three different moving speeds is obtained. The slower you move, the thicker the paint. The faster you move, the thinner the paint. The effect of that group of test sprays is closer to the mirror surface, so based on this speed, three more groups of up and down fine-tuning sprays are performed. After that, an optimal spray gun moving speed can be determined.

No matter how good a spray painter is, after mixing the paint and before preparing to spray paint, one thing he must do is to conduct a test spray comparison of three sets of samples. Only after finding out the optimal control points that vary depending on the temperature and environment at that time, the viscosity of the paint to be adjusted is different, and the types and characteristics of various paints are different, can the actual spraying work be carried out.