nathan125,
One thing that I've done in the past with one of my raised bed is, line the inside with plastic sheeting. I used a large piece of plastic sheeting that was 6 mil in thickness. You can use staples to hold it in place and then put lots of drain holes in the bottom. Then you can fill it up with whatever growing medium that you're using. The bed that I lined with plastic is still in great shape after 5 years of use. I expect that it will last another 5 or more years. You can get the plastic sheeting at most hardware stores (ie. Lowes or Home Depot). It only takes a few minutes to line a bed with the plastic. Any excess plastic sticking out, just cut it off with scissors. I think that it's a better option than using a deck sealer.
dpurdy
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