The top step of my frot stoop is breaking down and starting to crumble, particularly the very edge of the step. This has been going on about a month and seems to get worse with rain and snow. Is there a way to stop or slow down the decay? A sealant perhaps? Is there anything I can lay over the step? I intend to redo the entire stoop but can't afford it now and need a temorary fix. Your advice is welcome!