He brushed on an exterior oil-based primer, then two topcoats of satin latex. But the real secret came last: he did not caulk the bottom edge of the sill where it met the brick. Many people make that mistake. Caulk there traps water. Instead, he left a ⅛-inch gap—a “weep path”—so any future moisture could escape.
The next morning, he brought out two small cans from his workshop: a wood hardener (thin, like watery varnish) and an epoxy wood filler (thick, like modeling clay). how to repair rotted window sills
Crucially, he checked beneath. Rot that goes all the way through the sill’s thickness and into the wall framing is a different beast. This was surface rot—deep, but not structural. Repairable. He brushed on an exterior oil-based primer, then
Then he mixed the two-part epoxy filler. It smelled like a chemistry lab and felt like warm taffy. He pressed it into the cavity with a putty knife, overfilling slightly, mounding it above the original surface. He let it cure for a full 24 hours. Patience, he reminded himself. Rot took years. Epoxy takes a day. Now came the art. The cured epoxy was harder than the original oak. Hendricks pulled out a block plane and a rasp. He shaved the epoxy down to the level of the old sill, then used the rasp to carve the subtle front slope—the “drip edge”—that shed water away from the glass. Caulk there traps water
He even scored a fake wood grain into the epoxy with the tip of a hacksaw blade, just so it wouldn’t look like a plastic patch. A true repair shouldn’t hide; it should honor.
When you think you’ve removed enough rot, remove another half-inch into the healthy wood. Rot is like an iceberg; what you see is less than what’s there. Chapter Three: The Hardener and the Filler Hendricks vacuumed out the cavity and let it sit for a day with a small fan aimed at it. Wood must be bone-dry before repair.
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