- Dictionary : PIARC Road Dictionary/ English
- Theme : Roads / Construction / Flexible and Semi-Rigid Pavements
- Definition : Spreading a liquid binder over an unsurfaced close-textured pavement layer, the viscosity of the binder being such that it can penetrate by capillarity through the voids in the upper portion of that layer.
Note: this treatment is called ''road oiling'' if the purpose is mainly dust control on a low-volume road, and no additional layers are planned to be added; it is called ''penetration prime coat'' if the purpose is preparation of the base material prior to placing one or more additional layers.
- Synonyms : road oiling (US), penetration prime coat (US)
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