... Tamerlane diaphragm, sandwich plate, shockproof board.6.By coating different times,there is a painted a bake ,tow painted tow ... bake,three painted three bake,four painted four bakefour different coating processes obtained organic coated steel.7.According to the ... considered,polyurethane primer coating will be better.For back coating,please choose 2/2(two coating and 2 baking)process structure.there ...