How long does the interface agent for phosphogypsum plastering need to be brushed in advance?

Phosphogypsum plastering interface agent needs to be brushed 3 hours in advance.

Under the condition of natural ventilation, plastering can be carried out every 3 hours after the interface agent of phosphogypsum is painted. After brushing a layer of interfacial agent, naturally dry, and then brush the next layer of interfacial agent coating.

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