3-in-1 oil is not graded in the same manner as motor oils, which often use SAE (Society of Automotive Engineers) ratings. Instead, 3-in-1 oil is a multi-purpose lubricating oil designed for general household use, including lubricating hinges, locks, and small machinery parts. It's known for its versatility rather than a specific SAE grade. Its viscosity is somewhat lighter than typical motor oils, tailored for easy application on small mechanisms. Therefore, comparing it directly with motor oil grades like 10W-30 would be inappropriate due to its distinctive formulation and application purposes. The product's name reflects its ability to clean, lubricate, and protect metal surfaces, offering a convenient solution for routine maintenance tasks around the home and garage.

Yes, you can paint vinyl silk over matt emulsion, but proper preparation is key to ensure good adhesion and a smooth finish. Matt emulsion is generally absorbent and provides a good base for further coats. However, vinyl silk paint has a shinier, less absorbent finish, which could lead to poor adhesion if applied directly on a poorly prepared matt surface. To ensure the best results, lightly sand the matt emulsion to create a slight key for the vinyl silk to adhere to. Clean the surface thoroughly to remove dust and any contaminants. Applying a primer might be beneficial, especially if the matt surface is very porous or uneven. It’s also advisable to do a small test area first to ensure compatibility and that you are happy with the appearance.

To mix FD&C (Food, Drug, and Cosmetic) dyes effectively, it's crucial to understand their basic properties and how they interact. FD&C dyes are water-soluble and can be mixed to create a wide range of colors. Start with primary colors: Blue No. 1, Red No. 40, and Yellow No. 5. When mixing, use precise measurements for consistency and record your ratios for future reference. Gradually add dyes, mixing thoroughly to achieve the desired shade. Keep in mind the final product's pH and composition, as these can affect the dye's appearance. It's advisable to experiment on a small scale before committing to large batches. Safety gear, like gloves and masks, should be used to avoid skin and respiratory irritation. Lastly, ensure compatibility with the product's intended use, as some dyes might not be suitable for all applications.