Where moldings have been poorly decorated and/or paint buildup has left them in poor condition, simply sanding the area can help. This technique can be used on all kinds of moldings. Paint buildup in the grooves of the profile often creates an unsightly effect. Filling these areas as shown here improves their appearance. Flexible caulk cannot be sanded when dry, so it must be completely smoothed while still wet.
Smooth along the caulk with a wet finger (image 1). Carefully remove any excess with a clean, damp sponge (image 2). Smooth the caulk again with a wet finger.