hi i had just built my halfpipe recently and from the sides water has seeped in and warped the bottom of the pipe a decent amount. I have been applying coats of polyurethane but still have problems with the warping. Any tips on getting the wood unwarped. In some spots it seems as if water has warped all 3 plys making it impossible to screw the wood down with screws.
lemme know if anyone has tips on fixing this problem
thanks