Water paint construction tips

Many people may not be clear about what is water-based paint and what is oil-based paint when they first buy renovation paint, and for the second time at home, they want to brush new friends from the wall ground, for the first time. Contact, but also do not quite understand, so Xiao Qi today to water paint as an example to sum up the summary of a few tips for paint construction. However, before the water-based paint construction tips, Xiao Qi still has to give everyone the difference between water paint and oil paint. Water-based paint: Only use clear water as a diluent, which is harmless to human health. Contains no harmful carcinogens, non-toxic and odorless, it can stay after brushing. Because it does not contain harmful substances, it will not evaporate into the air, so it will not have defects such as yellowing, and it will last as new. The spraying method is mainly used for construction. Oily paints: Banana water and thinner are used as diluents and contain a large amount of harmful carcinogens such as benzene and xylene. Contains a strong irritating odor that is unbearable and harmful to the human body. Contains a large amount of harmful substances that endanger human health. Generally after 1-2 months of use, strong irritating odors evaporate to basically no taste, and harmful substances continuously release long-term volatilization, so they are easily yellowed and have poor persistence. Tip 1 Use clean water to adjust the coating to a suitable spray viscosity. Measure with a Coated Viscometer. The appropriate viscosity is typically 20 seconds to 30 seconds. If you do not have a viscometer for a while, you can use the visual method: stir the paint with a rod (iron rod or wood stick) and stir it up to a height of 20 cm to stop it. If the paint is not in a short time (several seconds), It is too thick; if it is off the edge of the bucket, it is too thin. To stay at a height of 20 cm, the paint is in a straight line, and it instantly becomes a drop of water. This viscosity is more suitable. Tip 2 Air pressure is best controlled at 0.3 to 0.4 MPa (3 to 4 kgf/cm2). The pressure is too small, the atomization of the lacquer solution is poor, and the surface will form pits; the pressure is too large to sag and the lacquer fog is too large, which wastes material and affects health. Tips The distance between the nozzle and the object surface is generally 300 mm to 400 mm. When it is too close, the paint film is easy to hang; paint mist is too uneven and prone to pitting, and the nozzle is far away from the object surface, and the paint mist is scattered on the way to cause waste. Slow-drying paint spraying distance can be farther, quick-drying paint spraying distance can be a little closer; thicker viscosity can be closer to a little, viscosity can be a little bit farther away; the so-called near-farther point refers to a small range of adjustment between 10 mm to 50 mm If it exceeds this range, it is difficult to obtain a desired film. Tip Four spray guns can be moved up and down, left and right, and the nozzles should be sprayed straight on the surface to minimize oblique spraying. When spraying on the both ends of the object, the hand that triggers the spray gun should be quickly loosened, so that the paint mist is reduced. Because the two ends of the object are often subjected to more than two spraying, it is the most likely cause of sagging. Tip 5 When spraying, the next step is to suppress the 1/3 or 1/4 of the previous track so that no leakage occurs. When spraying quick-drying paint, it needs to be sprayed in sequence one after another. The effect of make-up spray is usually not ideal. The technique of spraying the order of six is: first, after the first, after the outside. After the first height and then the low area, the first small area is large area, which will not cause the post-spray paint mist to splash on the sprayed paint film and destroy the sprayed paint film.