OSB + water = bad news all around.MyFishEatYourFish;2237703; said:advice for those who want to save money by building there own tank, don't cut costs by buying wafer board!!! it sucks. it's not as strong, doesn'e even attempt to resist water, and is a #%@&% to seel. i estimate i may have been able to cut the amount of resin i used to seel down to a half or even a third of what i used. so really, it cost more in the long run.