One. What are the requirements for applying seashell powder to walls?
Shell powder wall surface requirements: For newly constructed walls where a putty base has been applied, if the wall surface is smooth, clean, and free from bubbles, mold, and powder detachment, simply apply a coat of shell powder. For walls with bubbles, mold, cracks, or powder detachment, remove, fill, and sand the existing coating according to the shell powder application requirements to achieve normal wall surface construction standards. Before applying the shell powder, thoroughly clean the existing coating to remove any dust or debris. Apply two coats: the first coat should be thin to allow the shell powder to penetrate the wall, and the second coat should be applied after the first coat has dried.
Two, are the construction methods for new walls and old walls the same when using seashell powder?
1、Apply seashell powder to new walls
For new walls, ready-mixed putty paste should be applied to the bare wall. The putty paste protects and levels the wall surface. After applying the putty paste, the rough surface needs to be smoothed. The polished putty paste feels very smooth to the touch and will shed powder. once the putty paste is smoothed, it can be used with shell powder paint.
2. For walls undergoing secondary renovations, the appropriate treatment should be applied based on the specific condition of the wall.
Latex paint on walls:
If the wall surface exhibits blistering, powder shedding, or alkalinity, it must be removed. After removing the affected areas, the substrate should be prepared with putty powder according to the specified application requirements for the putty powder. only after proper preparation can the putty powder be applied.If the newly renovated walls are in good condition, the putty powder must be applied using a spraying method. To extend the lifespan of the walls, the existing latex paint should be lightly sanded, followed by application of two layers of putty powder (putty powder companion) before applying the putty powder.
Wallpaper Wall Surface: Since wallpaper requires a fixing base film, the wall surface will become hard and fixed. The best way to treat it is to remove the original base film and apply a base coat (putty base or seashell powder companion) before applying the seashell powder. A cost-effective option is to avoid removal and apply two base coats directly onto the base film, followed by brushing or spraying with seashell powder. However, this will affect the lifespan of the wall surface to some extent.
Algae-based wall finish:
If the wall surface has cracks, peeling, or is crumbling, it also needs to be scraped off and re-coated (with putty powder or shell powder). Since the diatomaceous earth particles are relatively coarse, if a smoother finish is desired, the diatomaceous earth wall surface can be lightly abraded before applying the base coat, followed by brushing or spraying with shell powder. This will create a wall surface that resembles a new wall.