Скачать или смотреть Epoxy-Sand Primer

Engineered cement overlays require an epoxy-sand primer because they shrink as they cure. The shrinkage will vary by brand, but lateral movement, as the product cures, is unstoppable. The sanded epoxy primer acts like Velcro to hold the overlay tight to the surface as it pulls itself laterally.

The way to avoid a common failure of cracking or full disbonding is to broadcast sand to rejection. Then there will be no chance for shiny spots that allow the moving overlay to slip as it cures.

A big thank you to JD Grafton for the advice to highlight the importance of saturation.
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