A preparatory coat (primer or base coat) applied before the final paint; a layer/process that improves adhesion and evens out the surface for a better finish.
壁を塗る前に下塗りを十分に乾かしてください。
Make sure to let the primer dry thoroughly before painting the wall.
木材はまず下塗りをし、その後上塗りを二回行った。
We first applied a base coat to the wood, then did two topcoats.
車の全塗装では下塗り剤を使って錆を防ぐ。
In a full car repaint, a primer is used to prevent rust.
色ムラをなくすために、下塗りは均一に塗ることが重要だ。
To avoid uneven color, it is important to apply the base coat evenly.