I have two exterior doors, one to the back of my house and one to my tool shed. Both are showing the effects of winter water splashing up on them at the base. The door to my shed is really bad. I don't want to replace the doors but would like to put a board over the base, like a kickplate to cover up the bad wood. All kickplates I have seen are brass. Not appropriate for either door and pricey to boot. Want to either screw or nail something on, the size of a kickplate, prime and paint to match the doors. What would you recommend? Would backer board work, the stuff they put in showers before tiling? I've never worked with that. Or is there something else better looking when finished? Don't want it to thick. Ideas? Randy