Which one to use first, transparent paint and closed paint for exterior walls?

In breaking the open paint and closing paint money, let's talk about the type of paint first; There are 18 categories, PU, PE, NC used for wood furniture, and others include light-curing paint, acid-curing baking paint, alkyd, phenolic, ester glue, and oil-based paint (generally tung oil or linseed oil polymerization). There are also latex paints and lacquers. In fact, the latter applications are not very extensive, and the most widely used ones are PU, PE, and nitro.

First of all, let's talk about the sealing paint; As the name suggests, closed lacquer means closed with lacquer; The sealing primer plays the role of sealing the pores of the substrate and the fiber catheter, which is film-forming and gelatinous, and it is difficult to sand. Rare points of general tone. The viscosity is still high.

The second primer is generally thicker, which is easy to polish and smooth, so the consistency point is generally adjusted. The transparency of good polishing is almost good, and the polishing of good transparency is slower. Therefore, the two-penny paint is divided into two categories: solid wood bottom (easy to sand) and sticker bottom (good transparency), according to the different production processes of the manufacturer, the number of times of painting will be different.

Therefore, sealing paint is a painting process in which the brown hole of the wood surface texture is completely closed by the paint, which is manifested as the paint film on the surface of the wood substrate is plump, thick, bright and smooth, and the sealing paint can be suitable for all wood substrates. Next, let's talk about open paint; For an explanation of the noun, please refer to the sealing paint above; Open lacquer refers to the ability to see the natural characteristics of the wood grain, just to change the color, which is a common finishing method in European and American countries, that is, the wood is colored with a water-based color paste on the treated substrate, and then sanded, primed, and then applied with a transparent topcoat. The basic process flow is as follows:

Sanding--primer--sanding--base coloring--secondary primer--sanding--surface color repair--top coat But open paint is overly dependent on the texture of the original wood matrix, so it is relatively strict and harsh in terms of material selection. Therefore, open paint is a kind of spray painting process that completely exposes the brown holes of the wood surface texture, which is manifested as obvious wood holes, clear texture and strong sense of nature, but its cost is high and the spraying technology is high. Generally speaking, to make open lacquer, the brown holes of the wood must be deep and obvious, such as oak, ash, etc.

Sum up; The main difference between closed and open is the substrate of the wood. In the case of the same substrate, the opening and closure of the wood conduit is mainly the construction amount and solid content of the paint, generally speaking, nitro is the best effect when used to open the wood matrix, PU needs to be diluted, and it is difficult for PE to be used to open the wood matrix. On the contrary, the effect of enclosed furniture is the best, the effect of PU needs more than 3 times of primer, and the effect of nitro is very poor, it is difficult to fully enclose, at most semi-enclosed.

If the exterior wall is a concrete base surface, the closed primer selects epoxy penetrating primer, and the economic penetration and sealing effect is good, and the transparent waterproof transparent asparagus polyurea varnish is selected, which is weather-resistant, wear-resistant and waterproof, and the Wanhua transparent asparagus polyurea coating can be directly constructed on the tile glass, with excellent adhesion and does not change the original decorative effect.