The selected stone protective agent must have better protection effect. You must consider the protection and decoration effects produced by different stone surface conditions. One important principle when selecting is that whatever the grade of the protective agent, having a test on part before large construction area. Make sure the stone protective agent effect then use in large area. It can avoid the bad maintenance effect caused by the mismatching and incompatibility of stone quality and protective agent. Detailed selecting methods can be categorized simply as follows:

1. Stone with smooth face can choose the kind of stone protective agent that can add the glossiness to stone.

2. If the decorative effect requires deepening the stone color, choose the brightening stone protective agent.

3. To keep the original appearance of stone should choose primary color stone protective agent.