About ET product have main defective mode color crack to occurred after caulking process ( defective rate = 0.67% of Dec'13)So, hypothesis about color after painting if heating awhile will rapid expansion of color and after that if color surface have the friction from caulking machine and heating awhile at color surface maybe reduce friction after caulking process it a maybe root cause color crack defective so, we will test using hot air gun blow to heat at the of the surface shell upper part