There is something you should know before you call a painter to spruce up your sliding patio door. If the operating door is not removed prior to painting, it will be difficult for the painter not to get paint on the weather-seal and this will adversely affect the ability of your door to keep out the cold.  And, after the paint hardens onto the weather-seal, you will likely notice a scrapping sound as the door is moved open and closed.  First removing the door will actually save the painter a little time as