Primer Method Adhesion 1 1 4 1 1 4.5 1 1 4.3 1 2 5.4 1 2 4.9 1 2 5.6 2 1 5.6 2 1 4.9 2 1 5.4 2 2 5.8 2 2 6.1 2 2 6.3 3 1 3.8 3 1 3.7 3 1 4 3 2 5.5 3 2 5 3 2 5