March 30, 2023 Longchang Chemical

What is the effect of thinner on paint gloss?

Paint itself is divided into high gloss, glossy, matte, flat, no light, etc. These are the range of gloss decided after the production of paint, this article only talk about the impact of thinner on the gloss, can not change the paint itself gloss.


Many people think that thinner is just to dilute the paint, it does not have any effect on the performance of its paint film. During construction, they use thinners at will, regardless of whether they are used for primer or topcoat. There are some people who are careful to use thinner for primer and topcoat separately, but they do not distinguish between manufacturers or between fast and slow drying thinners.


In this article, we will talk about the effect of thinner on paint gloss, and also several phenomena that occur in the field construction.


01 thinner is divided into fast-drying, standard, slow-drying, choose the right time to dry speed can make the paint gloss high


Different seasons paint manufacturers will automatically provide different volatile rate of diluent. Many manufacturers will be fast and slow drying thinner separate packaging logo. This provides a lot of room for adjustment on site.


02 Thinner with strong solvency will properly increase the luster of the paint


The role of thinner is to dilute the paint and reduce the viscosity, so that the paint can reach the required viscosity for construction and the best construction effect. After construction the thinner will all evaporate into the atmosphere and is difficult to recycle. This is the main reason why paint causes environmental pollution and is the main reason why everyone is replacing it with water-based paint. Therefore, the lower the price the better if it meets the requirements.


The process of dilution requires two things from the diluent:


A. Diluent solvency can not be too weak, if too weak will cause the paint flocculation into a group, can not dilute the paint. This needless to say, many people have encountered such events. Thinner into the paint, paint and thinner separate, the upper layer of clarified thinner, the following paint shrunk into a ball. And no matter how to stir, the paint is like a ball of bubble gum, sticky, and always does not melt with the thinner into one.


B. The solvency of thinner should not be too strong. Too strong thinner will cause the pigment in the paint flocculation, pigment precipitation from the paint. This type of phenomenon is more insidious and many times undetected. The solvency of the thinner may also dissolve the underlying paint, causing bottom-biting and other phenomena.


03 The effect of thinner on paint gloss


Too much thinner will reduce the luster, mainly due to the addition of too much thinner, the paint solid content decreases, the dry film becomes thin, the paint surface is not full, resulting in low luster.


04 Improper choice of thinner will also cause the following paint film ills:


Loss of light: the luster of the paint film is full before drying, and the luster is missing after drying or the luster of the paint film gradually disappears later.


Orange peel: the surface of the paint film is uneven, similar to the appearance of orange peel, grapefruit peel.


Clouding/spotting (silver powder paint small spots): the color of silver powder paint changes, forming a piece of dark or light color spots, often forming different color stripes along the direction of the spray paint.


Pinhole (pit): The paint is too late to replenish the paint after painting due to the rapid evaporation of the thinner, resulting in pinhole-like small holes or like leather pores.

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