Ultra Coat and Ultra Stain finishes are a meticulous and advanced process to ensure maximum beauty of your wood window and door interiors. Yet, wood is a natural material with character, color, and grain patterns with varying densities, even in lumber taken from the same tree. Colors and stain absorption will vary widely based on the wood’s natural character; therefore results are not guaranteed by Sierra Pacific Windows for color or grain consistency. While not always necessary, touch up in the field of the finish should be expected.