How to Fill the Second Coat over Tapered Seams

Fill the recess over a dry, bonded tape coat on a factory-tapered seam so the tape and both shoulders become one flat plane. This is not for butt joints.

What you need

Model 02990Black & Silver® Flexible Joint Knife, 8” (High Carbon Steel) $20.39 each$13.87 each at 100 or more
Model 09212Lightweight Blue Steel Taping Knife, 8” $9.74 each$6.62 each at 100 or more
Model 092238" Pro Project Blue Steel Taping Knife $15.97 each$10.86 each at 100 or more
Model 093238" Stainless Stainless Steel Taping Knife, extruded backing $20.37 each$13.85 each at 100 or more
Model 092538" Pro Project Blue Steel Taping Knife $11.45 each$7.79 each at 100 or more

joint compound the panel, tape and label allow
mud pan or hawk
small loading knife
straightedge

Steps

Confirm the seam is factory-tapered with recessed shoulders on both sides. If a knife rocks over a raised center with no shoulders, it is a butt joint.
Press each panel beside the seam. If they move, find the cause before adding compound.
Check the first coat has reached the compound maker's recoat condition. Rake a light along the tape for bubbles, loose edges and cracks.
Scrape only dry nibs, ridges and crumbs, if the label allows. Do not shave through to the tape.
Remove loose dust and crumbs. Check the blade edge and corners for dried compound.
Mix the compound only as its label permits. Load a ribbon on the working face of the 8" knife from the pan rim, not the whole blade.
Run the knife with both ends riding sound board so the blade fills the recess flush. Keep the tape covered without a hard center ridge.
Check across the seam with a straightedge under raking light. Leave the wider finish coat for the next step.

Tips

Pick the knife by feel. 02990 is an in-line joint knife with a high-carbon blade. 09212 is the lightest backed knife.
09223 (blue steel) and 09323 (stainless) have extruded backs that hold a firm fill flat. 09253 flexes more for a light feather.
09323 is the one stainless knife here. The others need cleaning and drying.
Never return scrapings or dried material to the clean compound.

Watch out

A second coat is not a repair for a bad first coat. Cut out and re-bed bubbles, loose tape and cracks.
Do not mix or thin compound beyond what the label allows. Compound that rolls, slumps or tears needs a material decision, not harder pulling.
Stop if panels move, a crack returns or there is moisture. Fix that first.

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