Staining PVC plastic can be tricky due to its non-porous surface that doesn’t readily absorb stains. However, it’s still feasible with the right approach and materials. Start by cleaning the PVC thoroughly to remove any grime or grease, as cleanliness is crucial for a successful staining. Next, use a primer designed for use on plastics; this will help the stain adhere better. Once the primer is dry, apply a stain specifically formulated for plastic or PVC. These stains are typically acrylic-based. It's essential to apply it in thin, even layers to avoid drips or uneven coloring. Allow it to dry completely between coats, following the manufacturer's recommendations for drying time. Sealing the stained PVC with a clear sealer designed for plastic will protect the stain and extend the life of your project. Always wear protective gear and work in a well-ventilated area during this process.

A wetting agent is a critical component in the development of photographic film. This substance, typically a surfactant, reduces the surface tension of the water, ensuring uniform coverage and preventing water spots during the drying process. Without a wetting agent, the film is prone to uneven drying that can result in spots and streaks, adversely affecting the quality of the final images. Commonly, photographers use a diluted solution of a wetting agent as the final rinse after the film has been developed, stopped, and fixed. This step is crucial for achieving clear and spotless negatives. It's a testament to the intricate balance of chemistry and technique in traditional photography, underlining the importance of even minor steps in the development process.

When applying polyurethane to kitchen cabinets, the general recommendation is to apply at least three coats. This ensures a durable and protective finish that can withstand the wear and tear common in high-use areas like kitchens. However, the exact number of coats might vary depending on factors such as the type of polyurethane (water-based or oil-based), the condition of the cabinets, and the desired level of sheen (glossy, semi-gloss, or matte). Water-based polyurethanes often require more coats than oil-based ones due to their thinner consistency. For a high-quality finish, consider sanding lightly between coats with fine-grit sandpaper and cleaning thoroughly to remove dust. It's also beneficial to apply a final coat of wax for added protection and enhanced appearance. If your cabinets are in a particularly high-traffic area or if you're refinishing older cabinets, you may want to apply up to five coats for extra durability.