However, when it comes to filling large holes, you need to be careful with the buying decision. If there’s any surface rot or paint on the wood, you can use a paint scraper or coarse sandpaper to get rid of it. After removing loose or badly rotted wood, simply brush the Bondo Rotted Wood Restorer onto the damaged area with the built-in applicator brush. Occasionally, you will get a piece of gorgeous wood that has voids or knots in it. PC Rot Terminator is a structural wood hardener designed to strengthen decayed or rotted wood. The only thing you can do is to drill a hole below the hole and angle it up into the bottom of the cavity. Use a brush to scrub the surfaces afterward and clean away the debris. This is generally not allowed on repairs that must satisfy a pest report. The solution is to fill the wood knots and voids with epoxy. You wouldn’t want to add wood putty, because it wouldn’t retain the look of the knots. To remove the rotted parts of the window frame, take a chisel or a flathead screwdriver and gouge it until the healthy parts are revealed. Use the claw of a hammer to dig out rotted areas from your wood. I have removed the rotten wood and applied wood hardener to the inside of the cavities. The material that you fill the tree hole with will not react to the weather in the same way the tree wood will. We have done repairs/restorations to beams where a amount of rotted wood is removed down to healthy wood (usually in a shape that is easy to replicate), the new wood is glued, epoxied, or nailed in place, then the surface is floated out with a 2 part wood filler product. https://todayshomeowner.com/video/how-to-patch-damaged-or-rotten-wood The undisturbed area at the bottom right of the mullion is an old epoxy repair, around which the wood continued to rot. But, you want a smooth surface. When you enclose it, the moisture and decay organisms are going to go wild. The mixture is a low viscosity liquid that penetrates porous surfaces filling and sealing voids with an epoxy that cures to a hard but durable component. Now, we are here to find you the best wood filler for large holes. In only 2 hours, the product will dry to a tack-free finish that can be filled with Bondo Wood Filler to complete same day rot repairs. Step 3 There is no practical way to excavate every bit of decayed or slightly decayed wood. Step 3 - Drilling Holes. If windowsill rot is confined to just a small area, a simple patch and fill is all that is needed. For, not all units will serve the purpose right in such cases. The market has a lot of wood filling products to offer. Sealed over with epoxy, the borate penetrates the wood, minimizing the chance of future decay. Car body filler would work but would be pretty expensive. In our case we cut the void and patched it with new wood—a Dutchman patch. 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