But what if you run into a unique problem that isn’t covered by standard tutorials? Instead, wipe the surfaces with a deglosser, such as Klean Strip Liquid Sandpaper Cleaner & Deglosser ($8.97 for a quart at Home Depot.) It's OK to use water-based products on top of oil paint.I often find that when it comes to renovation, the big stuff – like how to tile a kitchen backsplash – is all over the web. Because your house dates from 1954, avoid sanding unless you are certain the existing paint is lead-free. To ensure that the primer bonds to the wood and to any existing paint, lightly scuff up the surface first. Water-based paint sheds liquid water but lets water vapor through, allowing the wood to dry faster. Forest Service's research center in Madison, Wisconsin, on wooden decks (a good stand-in for a windowsill in a shower) showed that when water gets through, as it inevitably does, oil paint keeps the moisture from evaporating, so the wood is actually more prone to rotting. Oil paint is more impervious to water than latex paint, so it might seem to be the best option for a windowsill in a shower. One combination of products is Bondo Wood Restorer as the hardener (eight ounces for $18.97 at Home Depot) and Bondo Wood Filler, a two-part polyester formula (12 ounces for $13.68). ![]() When that dries, fill holes with a wood filler that doesn't shrink as it dries. Brush on wood hardener to solidify spongy wood fibers, creating a firm base. If you decide just to patch the wood and re-paint, first scrape off the loose paint and dig out any soft, rotted wood with a sharp tool. An alternative that wouldn't involve redoing the tile would be to wrap the flashing over the top edge of the tile along the windowsill and then cover that by attaching a small piece of molding to the bottom of the windowsill where it overhangs the tile. ![]() Unfortunately, there is no way to install the recommended flashing without redoing at least some of the tile, because the flashing has to wrap down behind the tile. One tip: Install a windowsill made of Corian, a countertop material that's impervious to moisture and doesn't need painting. Fine Homebuilding magazine's website has a great illustration and tips, which you can find by typing "window in tiled shower" into the search box at. But redoing the tile would give you a way to effectively seal the window and windowsill. If you can pull off tiles, or if an inspection shows water intrusion, you may need to redo the tile so the moisture doesn't rot out the framing of your house - probably not something you want to know. ![]() Having a leak from a window that isn't completely sealed just adds to the risk. Because the grout between tiles isn't waterproof, moisture can eventually get through, degrade the drywall and cause the tiles to come loose. In many houses built in the 1950s and later, it was used behind tile in showers, which no smart builder would do today. Greenboard is moisture-resistant but not moisture-proof. It might also indicate that the tiles are attached to a kind of drywall known as greenboard (for the color of its paper facing). If one or more tiles come loose, that's almost a sure sign of a moisture problem. Are all of the tiles flat against the wall, or do some bulge out? Are any loose, especially under the window? Test any suspect tile by trying to pull it off with your fingers. You can, however, do a few preliminary checks.
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