/diy/ - Do It Yourself

I have a shed with a concrete floor. When it rains for a long time the floor 'sweats' water. It comes up from within the concrete. For the most part, I just make sure everything is on bricks to protect it. I can't do that with the feet of my workbench though because I have to pound on it a lot when working and it slips off. What should I do to combat this? Seal the floor? Seal the wood? Cut the tops off some milk jugs and put them over the legs to protect them? Picture semi-related.