A _______ finish is primarily used for wall and trim where a high degree of washability is desired.

A gloss finish is primarily used for wall and trim where a high degree of washability is desired because it has a shiny, reflective surface that repels moisture and stains. This reflective quality not only enhances durability but also makes it easier to clean, which is crucial in areas prone to dirt and fingerprints, such as kitchens, bathrooms, and high-traffic hallways. The smooth surface of a gloss finish allows for quick wiping down without damaging the paint, making it ideal for surfaces that require regular maintenance.

In contrast, other types of finishes like matte or eggshell do not offer the same level of washability. Matte finishes, while providing a sophisticated and non-reflective look, are more porous and tend to absorb stains, making cleaning a challenge. Eggshell finishes have a slight sheen, but still do not provide the same level of durability and washability as gloss, and satin finishes also provide some sheen and durability but fall slightly short of gloss in terms of resistance to cleaning. Thus, for applications requiring frequent cleaning, a gloss finish is the optimal choice.