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The role of putty

When using putty, it is necessary to ensure that the coating is uniform and has strong adhesion, in order to guarantee the perfect effect of subsequent painting.

Reasons for the "foaming" phenomenon and preventive measures

The occurrence of "bubbling" phenomenon is primarily related to several factors. Firstly, if the moisture on the substrate or the oil and solvent removed with degreaser has not fully evaporated before applying putty, it may lead to "bubbling". Secondly, overly humid climate or spraying primer and topcoat within a short period of time after water sanding may also cause issues. This is because the talcum powder in the putty has a certain hydrophilic nature. During the water sanding process, moisture may penetrate into the putty. When the enclosed paint film is heated, the volume of moisture expands rapidly, breaking through the paint film and forming "bubbles".

In addition, using a poor-quality diluent when spraying primer is also a potential cause. Poor-quality diluent has strong dissolving power and is prone to penetrating into the putty. When the temperature rises, the unvolatilized gas may break through the topcoat layer, forming "bubbles".

To prevent the "bubbling" phenomenon, it is essential to ensure that the substrate is clean and completely dry before scraping. Additionally, using the recommended matching diluent by the manufacturer is crucial.

Precautions for using curing agent

When mixing putty, the mixing ratio of the main putty to the curing agent must be precise. Generally speaking, the recommended ratio is 100:1-2 in summer and 100:2-3 in winter. If the curing agent is added excessively, it will lead to excessive heat generation, increasing the risk of blistering and pinholes. At the same time, the scrapable time of the putty will be shortened, resulting in insufficient wetting time between the putty and the metal surface, which in turn affects the adhesion between the two. In addition, excessive curing agent will also increase internal stress, thereby damaging the adhesion between the metal surface and the putty, leading to unsatisfactory sanding results.

On the other hand, if the curing agent is not added sufficiently, it will lead to insufficient curing, making the surface sticky and affecting the polishability. During painting, issues such as poor adhesion, wet surface, burrs, and color bleeding may occur. Especially in environments with large temperature variations, fine cracks are prone to form on the surface.

Therefore, when mixing atomic ash and curing agent, it is essential to ensure uniformity. Uneven mixing can lead to uneven curing of the coating film, resulting in issues such as poor adhesion, bubbling, uneven surface, and color bleeding after painting.

 Other precautions

In the process of mixing and using putty, besides ensuring the precise mixing ratio of the main putty and the curing agent, there are several aspects worth noting. Firstly, pay attention to the environmental temperature and humidity, as they can affect the curing speed and performance of the putty. Secondly, ensure the cleanliness of tools and equipment to avoid the impact of impurities on the putty. Furthermore, operate with care and patience, as the curing process of the putty takes a certain amount of time. Lastly, after use, clean up the site promptly to ensure a clean and safe working environment.

1. When dealing with thick coatings, it is recommended to apply a thin layer of putty first, followed by a thicker layer. This approach can reduce the occurrence of pores and enhance the adhesion between the putty and the substrate. If multiple layers of putty need to be applied consecutively, please ensure that the surface of the previous layer is dry before proceeding with the next layer.

2. Putty is not suitable for use with one-component primer, but it works extremely well when paired with two-component primer and electrophoretic paint. One-component primer cures into a film through solvent evaporation, but its solvent resistance after drying is poor. The active solvent styrene contained in putty has strong solubility. If the putty coating is scraped onto one-component primer, it may cause compatibility issues such as lifting.

3. It is not advisable to perform water sanding on putty before it dries on the surface. At this stage, the putty is still reacting and releasing heat. If sanding is performed at this time, it may lead to cracking due to thermal expansion and contraction.

4. Under climatic conditions with high humidity, the drying time required for putty will be relatively extended.

5. Make sure to ensure that the putty is completely dry before proceeding with the painting operation.

6. It is strictly prohibited to use substances such as water or thinner to reduce the viscosity of putty for construction purposes.