I have bowed a many of them because they were too straight. Lil suckers will creep out of the RR pipes if too straight, catch on a vine & SNAP !
I usually wet them good, bow them on a board with the ends taped down & a block of wood in the center, dry them with a hair drier or heat gun & leave them sit overnight. Next morning it will have a bow in it & you can finish it. To take a bow out I just bow it the opposite way on the board & do the same thing.