To start, paint all the coasters white - this gives them a good base coat for whatever color you put on top.

首先，将所有杯垫刷成白色，不论你配什么样的花色，白色都是完美底色。

youdao

The base coat is critically important to leather finishing.

底涂的作用是极其重要的。

youdao

WK 8138 is used in the pre-bottom and base coat of polished or ironed leathers.

WK 8138用于抛光或熨平的革预底层和底层涂饰中。

youdao

Ms. Azario offers clients a demi-couture service in which they can choose their own trims (in a block color or embroidery) on a base coat of white.

WSJ: The Battle of the Boudoir | How to Achieve Design Harmony in the Bedroom

Though the labeling does not explain how the works are made, some reliefs appear to be molded, others incised, then painted by applying pigment directly onto the clay or on a base coat of lime or other material.

WSJ: Theater, Life, and the Afterlife | China Institute | A Dynasty Without the Hereafter? | By Lee Lawrence