Pohjustusta

Pohjustusta is the Finnish term for the priming process in painting and surface finishing. It refers to applying a primer or base coat to a substrate before applying finish coats. The purpose is to improve adhesion, seal porous surfaces, and create a uniform base for the topcoat.

Common primer types include water-based acrylic primers for walls and ceilings, alkyd or oil-based primers for wood and metal, and shellac-based primers for stain blocking. The choice depends on substrate, topcoat, and desired properties such as stain blocking or moisture resistance.

Application and preparation: clean and dry surface, repair defects, sand glossy finishes, remove dust. Apply primer evenly, using brush, roller, or spray, following manufacturer drying times. Some surfaces require more than one coat. The primer influences final color, appearance, and topcoat durability, and may slightly tint the topcoat.

Practical considerations: compatibility between primer and topcoat, ventilation and environmental factors, coatings labeled for interior vs exterior use, and waste disposal. In professional settings pohjustusta is part of surface preparation and can reduce maintenance costs by extending topcoat life.