How to Feather the Final Coat Over a Patch

Feathering the final coat hides the edge of a sound wall patch. Use it when the patch is solid and only the shoulder still shows.

What you need

Check the patch is solid. If it moves, lifts at an edge, or is damp, repair it first.
Set a light so it rakes across the wall. Find the shoulder, where the patch rises from the wall.
Pick a knife width you can control. Narrow suits tight access, broad suits a larger patch.
Clean the knife edge. Crumbs and nicks leave a line on every pass.
Load a band of compound on the edge, enough to cover the shoulder without flooding the center.
Draw from the patch across the shoulder onto sound wall in one motion. Carry less compound toward the wall.
Keep moving as the blade leaves the wall. Do not plant it and lift straight off.
Rake the light across it while wet. Stop when the coat is smooth and thins out to no edge.

Give each shoulder segment its own pass. Short strokes around the patch leave a ring of starts and stops.
If both corners of the knife leave rails, stop and clean or check the edge before another pass.
Wet shine hides ridges. Judge the patch again dry and again after primer.
Do not keep widening the feather until the whole wall is patch.

Hollow, cracked or moving patches go back to repair. A finish coat cannot fill or hold them.
Paint in homes built before 1978 may contain lead. Older patching compound and texture can contain asbestos.
Follow the compound maker's instructions for mixing, drying time and primer.

Questions about the right tool for your job? Email cs@hydestore.com or call 508-916-6442.