How to fix sandstone murals
Mold: plaster mold, plaster model to choose the strength of gypsum is better, if it is a relief or the bottom surface of relatively large nor above high and no out of shape, that is to say from the bottom or back position can reach in no plaster mold any location operation form directly poured gypsum; if do not meet the above conditions, to insert plastic sheet block, plastic pallets and stationery shop can block, is to ensure that the principle of the complicated structure of the side of the basic integrity, do not try to pick up the complex position to insert, to do the mold can accurately group together, which can clean out mud to every place to brush to the isolation agent (floor wax or Vaseline) to fill sandstone. On the plaster before the first use of soap water (washing powder out of the bubble) to spray the clay again, you can release more convenient, clean mold. Gypsum to be divided into two to three times, the first time, gypsum is more rare, backhand thrown up, easy to flow, the details is not easy to generate empty; second times, a strong gypsum slurry, the backhand thrown up, have a certain thickness, can also prevent the gypsum head over the missing part; third times a thick pulp, up by hand paste, the mold to achieve 2-3 cm thick, the thickness is achieved, the inserted outside excess gypsum knife shovel, insert all exposed, it is clear to each block, after a little larger mold to add skeleton (if it is very small the sculpture is not necessarily to add the skeleton), is generally used with wood, hemp or glass fiber in the water after the plaster for tying wood and gypsum. Skeleton to form a well shaped, relatively strong. From the insert position gently pry each separated out of small pieces, then dig out the mud, remove clay inside the mold frame, flat, clean, damaged gypsum can be used to repair it, then you can produce.
The model is not necessarily the mold used for sculpture sculpture, wood carving, stone carving can also be a variety of three-dimensional shape of things, of course, clay is the most convenient; for mold materials can be gypsum, glass steel, silicon rubber material production; as you say, quartz sand and resin bonding.Clay sculpture practice needless to say, if you can not even do this, you do not try their own.
Upstairs good funny, if it is a sturdy cement wall with marble glue, if the sand area is not large, can choose glass glue and the frame is fixed, but it is best to anchorage, so as to ensure that no danger of anything going wrong
