When the wall is opened, it is treated with quick-drying powder or treated with cement
Do the granules of course, but your cost is too high can be used with
Depends on the degree of flat, if not affect the use of no relationship, such as the impact of threading or over the water will use the hammer to cut after the re-open.
Black and white sandwich is PE, can not do it, I know these are the raw materials to do the refining.
