Spacklas

Spacklas is a term used in construction to designate a plaster-like finishing compound applied to interior walls and ceilings. It is used to patch, level, and finish surfaces prior to painting or wallpapering. Spacklas formulations vary, but most consist of a binding component such as gypsum, cement, or lime, combined with fillers and sometimes polymers or added fibers to improve adhesion, flexibility, and crack resistance. Gypsum-based spacklas set rapidly through hydration and produce a smooth surface suitable for paint; cement-based versions offer greater strength and weather resistance for exterior use; polymer-modified variants improve adhesion and elasticity to accommodate substrate movement.

Application techniques typically involve mixing with water or a pre-mixed paste, applying with a trowel or putty knife, building up layers in thin coats, and sanding after curing to achieve a uniform finish. The material is selected based on factors such as substrate type, desired finish, and environmental conditions. Spacklas is commonly used for patching small holes and cracks, leveling uneven walls, and preparing surfaces for subsequent coatings or decorative plasterwork.

Etymology and usage note that the term has historical usage in Central and Eastern European trades and has been adopted into some English construction jargon as an equivalent of spackle or joint compound in certain contexts. Limitations include possible shrinkage and cracking if not properly cured or if substrate preparation is inadequate; appropriate drying conditions and ventilation are important during application.

See also: plaster, spackle, joint compound, putty, decorative plaster.