How to make a mural

The general procedure for the production of frescoes:

1, wall substrate treatment

(1) nail hemp and pressure hemp. Nail hemp method is in the billet brick seam, every interval of 50cm nail wood pegs or bamboo wedges, will be wrapped around its hemp, called nail "hemp pull", or in the nails back and forth between the winding, pulled into a net. Pressure hemp method is: in bricklaying on the hemp horizontal pressure in the wall, plastering bottoming out the hemp scattered spread, rolled into the gray. Nail hemp and pressure hemp method can be used simultaneously.

(2) to the wall water. Craftsmen have "water is the mason's glue" said. Clean and moist wall surface is conducive to the adhesion of the wall and painting.

2, painting wall priming

(1) after the previous procedure on the wall surface to wipe a layer of hemp knife priming mud ash. This layer of ash to level the main, is coarse mud ash. Coarse mud from the clay (mud) and washed large sand, plus hemp knife (straw) and even. With a large spatula on the wall, a thick layer of about 2 cm. the surface is not too light, can also be used to slash the tile knife, easy to the second layer of the wall firmly.

(2) the second layer of fine mud. Fine mud from the clay and fine sand (soil 6: sand 4) plus hemp knife, hemp pulp, animal hair, etc. stirred evenly mixed, in the first layer of ash dry to about seventy percent of the second layer of ash on the cover. Should try to use a large trowel rubbing flat.

The specific method is to soak the clay in water. Stir with a wooden stick into a thin porridge, let the residue sink, clarified out of the container, and then add fine sand and hemp knife mix well. When wiping to the wall, you can wipe with water spray. If the area is large and can not be wiped out at once, it can be wiped and rolled in sections. Thickness of about 1.5cm. the whole bottom gray (including the first, second layer) thickness should be at least 2cm ~ 3cm above.

Some places, painting the wall surface layer of plaster, there are mixed with bushels, cotton, wheat husk. Sand plaster, rather than white ash (lime), "is because the sand is stony, not alkaline, alkaline has the disadvantage of eroding the color". (Mr. Liu Lingcang language)

3, brush cover wall surface

(1) brush from the slurry. In the bottom of the mortar is not dry, brush chalk soil paste (chalk soil, also known as wenxi soil, Beijing commonly known as soil powder).

Since the slurry mixing method: the chalk soil into the basin, plus cool water to soak, half an hour after the soil is dissolved, stirred with a wooden stick into a porridge, and then add raw soybean milk, the proportion of each accounted for one-half, with the brush brush on the wall, the line of the pen force to be uniform, horizontal and vertical brush once, by the time the substrate has not yet dried when brushing, a short pause, and then rolled with a spatula flat. Brush white slurry avoid using lime, lime hot, easy to color erosion discoloration, and then a way is, in the second layer of primer, no longer brush white slurry.

(2) brush glue alum water. Painting wall production of the last process is to brush one or two times the glue alum water, to be dry after painting.

Glue alum water mixing method is: first alum research into powder, with warm water, and then the temperature of the dilute glue into the water, stirring can be. Proportion is: glue 2, alum 1, water 25. glue with a wide range of glue, the nature of the soft not violent. Gum will be slippery and stagnant brush, alum big astringent brush. In the past, the way to test the size of the glue and alum is to use the tip of the tongue to try, such as sweet, slightly astringent, it can be. If the tip of the tongue is astringent, the amount of alum is too large. Brush glue alum water, use a brush to brush a brush on the wall, do not let overlap, overlap will make the alum uneven, affecting the effect of painting.