Three trees paint paint
Glass bits have a spade-shaped carbide point, used to drill holes in materials of glass, ceramics,etc. They generate high temperatures and have a very short life. Holes are generally drilled at low speed with a succession of increasing bit sizes. Diamond drill bits can also be used to cut holes in glass, and last much longer.
It is an alloy triangular bit mounted on the ordinary Electric Hand Drill, which has high hardness, sharp blade and good precision, and is specially used for opening holes in ceramic tiles. But the drill wears too much into concrete to be used on concrete.
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Spray painting is generally used for large-area construction or spraying of objects, parts, etc. that have complex shapes and are difficult to paint with a paint brush. The key to the spray is the number of passes. More often than not, and each time you spray thin, the effect is good. Once sprayed too thick, the paint can easily flow, which is commonly known as "sag (falling)" When using the spray gun, take care to wear a mask to avoid inhaling the paint. The spray gun should be 30-40 cm away from the spray surface.
When spraying, the spray gun must be constantly moved and cannot be directed to one place. The spray gun should be kept parallel to the spray surface and perpendicular to the spray surface. It should not be swayed so as to avoid uneven spraying of the paint layer. 
Paint construction should pay attention to the problem
There is no big difference between the process of painting and the process of hand painting.