Hey everyone! So we are having our basement redone and its brand new drywall in walls and ceiling. the walls are perfect and primed and ready to be painted. The ceiling has several seams that kep showing through after being spackled and sanded multiple times. There was never any tape used on ceilings. The work was done by my husbands friend and he hasn't been back in over 4 months. I am tired of waiting and want to do it myself. What do I do to fix my problem? I've never done this before. Thanks!