I cut the long molding into 4 pieces to make a mirror frame. I should have placed them on the mirror to check if they were ok before I sanded, primed, painted, and coated finish protector on them. Now, they are all done, but the pieces are so warped, they cannot even be glued onto the mirror. I did use clamps to hold the bottom one, yet both ends did not want to stayed.

WHat can I straighten the painted molding? Thanks.