Poor water resistance, white after water contact

Some genuine stone paints will appear significantly whitened after being washed and soaked by rain, only to return to their original state on sunny days, which directly reflects their poor water resistance.

Reason one: The quality of the ru liquid is lower.

Low-cost RUL often adds an excessive amount of surfactants to enhance stability, which significantly reduces the water resistance of the RUL itself.

Reason Two: Insufficient usage of RU fluid

High-quality RU liquid is more expensive, so manufacturers often add only a small proportion to save costs. This results in the paint film of real stone paint being loose and not dense after drying, with a high water absorption rate and reduced bonding strength. In prolonged rainy weather, water can渗透 into the paint film, causing the real stone paint to turn white.

Reason three: Excessive thickener

Manufacturers often add large amounts of hydroxypropyl methylcellulose, hydroxyethyl cellulose, and other thickening agents during the production of genuine stone paint. These substances are water-soluble or hydrophilic, and remain in the coating film after the paint sets, significantly reducing the water resistance of the coating.

Solution:

Select Premium RU Liquid

Highly water-resistant polyacrylic polymer, an excellent高分子acrylic polymer, is chosen as the film-forming material, enhancing the water resistance of the genuine stone paint from the source.

2. Increase the proportion of RU liquid

Increased the proportion of the RU liquid, conducting extensive comparative tests on the addition of the RU liquid to the genuine stone paint, to ensure a dense and complete coating is achieved after the application of the genuine stone paint, effectively blocking the invasion of rainwater.

3. Adjust the hydrophilic material ratio

To ensure product stability and workability, it is essential to add hydrophilic substances like cellulose. The key is to find the precise balance point, which requires repeated experimentation.

Spray splatter, significant waste.

Some true stone paints may chip or splatter during spraying, potentially wasting up to 1/3 of the material. DAD 217 bentonite can address this issue.

Reason One: Improper aggregate gradation

Natural stone chips in stone paint cannot be of uniform size; they must be mixed with different sizes. If uniform-sized chips or an improper mix is used, splatter is likely to occur.

Reason Two: Inadequate Construction Operations

Possible causes for splatter include an oversized nozzle diameter and improper pressure selection for the spray nozzle.

Reason three: Improper paint viscosity

Improper adjustment of paint viscosity can lead to sanding and splattering during spraying, resulting in severe material waste.

Solution:

Adjust the aggregate gradation

Overuse of fine-grained aggregates can diminish the surface texture of the paint film, while excessive use of large-grained aggregates can lead to splattering and sanding off. Only by using a proper gradation ratio can a uniform and consistent finish be achieved.

2. Adjust construction operations

If it's due to spray nozzle issues, then adjustments to the nozzle diameter and pressure are required.

3. Adjust Paint Viscosity

If the cause is due to paint viscosity, then the viscosity needs to be adjusted.

Three: Stone Paint Discoloration

Reason one: The impact of basicity/alkalinity at the grassroots level; when the alkalinity exceeds 9, it leads to flowering phenomena.

Reason two: Uneven thickness during construction can easily lead to flower patterns, and in addition, insufficient application of the genuine stone paint can also cause the appearance of flower patterns due to the thin paint film.

Reason three: An excessively high cellulose ratio during the production of the stone paint is the direct cause of the blooming issue.

Solution:

Tightly control the pH level at the grassroots level, using alkaline-resistant primer for bottom coating to prevent the precipitation of alkaline substances.

2. Strictly adhere to the normal construction material quantities, without cutting corners; the standard application rate for genuine stone paint is 4.5-5.5 kg/square meter.

Maintain a reasonable proportion of cellulose content as a thickening agent.

Section 4: Yellowing of Real Stone Paint

True stone paint yellowing refers to the color turning yellow, simply put, which affects its aesthetic appeal.

The primary cause is that the manufacturer used a substandard acrylic solution as a binder, which, upon exposure to ultraviolet sunlight, undergoes decomposition, releasing colored substances, ultimately leading to yellowing.

Solution: Utilize high-quality ru liquid as a binder to enhance product quality.

Section V: Soft Coating Film

The primary reason is that a quality stone paint film should be very hard, unmovable by nails. The film being too soft is mainly due to an inappropriate choice of raw materials or low content, resulting in an insufficiently tight coating during the film-forming process.

Solution: To produce real stone paint, avoid using the same RUC liquid as for making RUC paint. Opt for a composite solution with higher adhesion and a lower film-forming temperature.

Six: Coating Issue

Coating Cracking

Reasons typically include cracking at the base layer; the base layer not being segmented into blocks, or the blocks being too large; excessive amount of coating applied at once, resulting in a thick layer; the coating being too thick and not properly thinned; or inherent defects in the coating itself, all of which can lead to cracking of the coating.

Inconsistent Coating

Due to the use of paints from different batches; separation or the presence of floating water on the surface during storage; insufficient mixing before spraying; varying viscosity of the paint; unstable air pressure during spraying; and changes in the nozzle diameter of the spray gun due to wear or incorrect installation.

Peeling and Damage to Coating:

The reasons are as follows: excessive moisture content in the sub-layer during paint application; mechanical impact from external forces; low construction temperatures resulting in poor paint film formation; improper timing or method for removing the tape, causing damage to the paint; no cement footer line applied at the bottom of the exterior wall; and failure to use the matching primer paint.

Bubble and blistering on coating:

The reasons are: excessive moisture content in the base layer during paint application; insufficient strength in cement mortar or concrete substrates due to inadequate curing age or low maintenance temperature; substandard design strength in mixed mortar substrates; incorrect mix ratios during construction; subpar quality of the paint; failure to use a sealing primer; and applying overcoat paint before the main coating surface is fully dry.

Coating Too Soft

Improper selection of the ru liquid is a primary cause of the soft coating, and insufficient ru liquid content is also a contributing factor. It is recommended to choose genuine stone paint ru liquid, with an adhesive strength not below 3 kPa and a minimum film-forming temperature not below 20°C.

Inconsistent Coating

Due to the use of paint from different batches; paint stratification or surface floating water during storage; insufficient mixing before spraying; varying paint viscosity; unstable air pressure during spraying; and changes in the spray nozzle diameter due to wear or incorrect installation.