Probably wouldn't hurt. Didi you buy these blanks or cut them from a tree you cut up? For stock blanks I've bought, if I know I'm gonna use them within 6 months to a year, I don't bother, but if they are gonna be around much longer then that, I seal them. If you cut out the blanks from recent tree, I would have waited before cutting the shape with painting or waxing the ends. Let the planks dry before cutting the shape, internal stresses will just twist the blanks as it drys.