NF T34-201-7*NF EN 927-7:2020 Paints and varnishes - Coating materials and coating systems for exterior wood - Part 7 : assessment of knot staining resistance of wood coatings
2020NF T34-201-7*NF EN 927-7:2020 Paints and varnishes - Coating materials and coating systems for exterior wood - Part 7 : assessment of knot staining resistance of wood coatings