I just set my new one up and its not to bad to do but you need some tools to do it. I used parafin wax to fill the gaps and an 8 inch dry wall knife to spread and flow the wax thats heated with a heat gun. Shave the wave into smaller flakes and heat the knife then draw the wax out until its smooth. Some people use drywall mud, some use bondo but they will crack and cause lumps if some thing bangs down on it(ball, beer bottle, etc). Have some patient it will workout fine if not call a pro and have some beers and watch.