16. USING THE WRONG PAINT OR PAINT FINISH – It is common for homeowners to test paint colors but rarely do they test paint finishes or paint brands. Different finishes can completely transform a room. The challenge is that many homeowners rely on the local paint store employee to tell them what finish to use. However, every project requires its own custom finish. For example, one might find flat paint for ceilings and perhaps some walls while semi-gloss might be used for bathrooms. Gloss may be found for trim. However, there are NO rules when it comes to paint, there are however personal preferences and paint finishes that hold up better in certain rooms.