The ability to touch up a painted surface depends on the gloss and colour of the product, the length of time it has been on the surface, and whether it is oil-base or latex. Generally, flats touch up well in both oil and latex. Oil-base eggshell and semi-gloss paints lose about 25 to 30 percent of their applied gloss after 10 to 12 weeks. At this point, even paint from the same can appear overly glossy and take many months to mellow and even out with the original surface. As a general rule, latex at all gloss levels will touch up better than oil because there is much less change in the gloss and colour of latex as it ages.
When latex paint is applied in temperatures below 10oC (50oF) - for example, during colder months on new construction - the film-forming properties of the paint are adversely affected. This can cause the colour of the paint to be lighter than if it dries in warmer temperatures.
When touching up a paint finish, it's important to use the same application tool that was used when the surface was done originally. Brushes and rollers leave different surface textures, the result being that if you use a brush to touch up a wall that has been rolled, the fix will be quite apparent.
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