Yes, formwork panels can be painted. However, it is important to use the appropriate type of paint that is suitable for the material of the formwork panels, such as plywood or steel. Additionally, the surface of the formwork panels should be properly prepared before painting to ensure good adhesion and a smooth finish. It is also important to consider the potential impact of the paint on the concrete surface that will come into contact with the formwork panels. **

Today, used car oil is not used as formwork release oil for concrete formwork. This is because used car oil contains contaminants and impurities that can negatively affect the quality and strength of the concrete. Instead, specialized formwork release oils are used, which are specifically designed to provide a clean and smooth release of the concrete from the formwork without compromising its integrity. These release oils are formulated to be environmentally friendly and safe for use in construction applications. **

To plaster formwork stones, you will first need to prepare the stones by cleaning them and ensuring they are free of any debris. Next, mix the plaster according to the manufacturer's instructions, making sure it is a smooth consistency. Apply a thin layer of plaster to the stones using a trowel, making sure to cover the entire surface evenly. Allow the plaster to dry completely before sanding or painting as needed for the desired finish. **

To close a formwork, you need to follow these steps: 1. Ensure that all the necessary reinforcement and embedment items are in place. 2. Securely fasten the formwork panels together using clamps or ties to prevent any leakage of concrete. 3. Check for any gaps or misalignments and make adjustments as needed to ensure a tight seal. 4. Finally, inspect the formwork for any defects or damage before pouring the concrete to ensure a successful and safe construction process. **

The cost of formwork boards can vary depending on the material, size, and quality. On average, formwork boards can range from $20 to $50 per square meter. Factors such as the number of uses, durability, and ease of installation can also affect the price. It is recommended to compare prices from different suppliers to find the best option that fits your budget and project requirements. **

To calculate the formwork area, you will need to measure the length and width of the formwork in meters. Then, multiply the length by the width to get the area in square meters. If the formwork is not a simple rectangle, you may need to break it down into smaller, simpler shapes and calculate the area of each shape separately before adding them together to get the total formwork area. It's important to ensure accurate measurements and calculations to avoid any material wastage or errors in construction. **

The mortar used for concrete formwork blocks is typically a type of cement mortar, such as Portland cement mortar. This type of mortar is commonly used for its strength and durability, making it suitable for supporting the weight and pressure of concrete formwork blocks. It is important to use the correct type of mortar to ensure the stability and integrity of the formwork structure. Additionally, additives may be included in the mortar mix to improve workability and adhesion. **

The formwork of a column is typically removed after the concrete has achieved sufficient strength to support its own weight and any additional loads it may be subjected to. This usually occurs after about 24 to 48 hours, depending on the type of concrete mix used and the environmental conditions. It is important to follow the recommendations of the structural engineer or the concrete supplier to ensure that the formwork is removed at the appropriate time to prevent any damage to the column. **