Undercoat
12) primer - a paint and varnish material that, after being applied directly to the surface, forms a protective paint and varnish coating;
Source: Government Decree of the Russian Federation dated 09.03.2010 No. 132 "On mandatory requirements with regard to certain types of products and related design (including surveying), manufacturing, construction, installation, commissioning, operation, storage, transportation, sale and disposal processes contained in technical regulations of the Republic of Kazakhstan, which is a state - member of the Customs Union"
Primer: a suspension of pigment or mixture of pigments with fillers in a film-forming substance forming after drying an opaque uniform film with good adhesion to the painted surface and topcoats intended for improving protective properties of coating systems
Source: "GOST R 51693-2000. State Standard of the Russian Federation. Anti-corrosion primers. General technical conditions"
(adopted and brought into effect by the Order of the Russian State Standard from 22.12.2000 No. 401-st)