The role of the primer is to close the wall and resist the alkaline material that the cement layer of the wall seeps out. The primer can also increase the hardness of the gray layer of the wall, and can also improve the adhesion of the topcoat, due to the primer coating the wall. The body is closed, preventing the wall from absorbing the top coat. The top coat stays on the surface, thus increasing the fullness of the finish.
Only in the extremely low-demand project renovation (such as whitewashing of walls or underground works), the use of primer is not considered due to price and use environment. The effect of home decoration is required by advanced decoration and the service life is relatively long. The cost can also be affordable, it is recommended to use a primer.
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