Etching Fluid

BEECK Etching Fluid reliably removes sinter skin, a vitreous glossy high-tension and impermeable accumulation of binder on the surface of felted and floated lime and lime cement renders. An unremoved sinter skin is a substrate defect according to VOB/C and poses the risk of stress induced spalling, for example during driving rain. The gas tight sinter layer also disrupts the carbonation and recrystallisation of "healthy" lime renders and plasters. They become worn and crumbly underneath the glass-hard layer. Creating a stress-free, porous and firm, surface zone is particularly important for pore deep, permanent silicification of active silicate paints such as BEECK Pure Crystalline and Beeckosil. At the same time, a uniformly absorbent homogeneous surface is created by the etching, which makes it possible to apply smooth, seamless and stain-free mineral coatings. The acid neutralizes within a few minutes on the highly alkaline substrate. Rinsing with water is therefore not for neutralization purposes, but instead to remove exposed textural and aggregate particles on the surface of the render. Especially in interior areas, these can also be removed from the plaster with a stiff broom before coating.

Features and benefits:

• For use on interior surfaces and on façades.
• Water thinnable: concentrate, to be thinned with three-five parts water.
• Suitable for solid lime and lime-cement render or plaster.
• Reliably removes lime sinter layers.
• Creates a substrate to VOB/C requirements and suitable for painting.
• Optimum silicification of subsequent silicate coatings.
• Reduces absorbency and the staining.
• Pure mineral acid and neutralization products.
• Neutralization products are water insoluble and therefore efflorescence-free.
• If used properly, the neutralization is complete and the rinsing water is acid-free.
• Non-flammable.