The design of the base acrylic is the primary determinant of coating performance. Monomers are selected according to the desired final film properties. For example, methyl methacrylate is chosen for gloss and hardness. Often styrene is incorporated for additional hardness, gloss and compatibility with some solvents. For acrylic backbone strength, flexibility and toughness, butyl methacrylate or 2-ethylhexyl methacrylate are often considered. If flexibility is desired, butyl acrylate or ethyl acrylate are possible co-monomer choices. Typically a balance of hard and soft monomers is selected dependent on final film hardness, toughness, and durability.