Flatten Veneer Bubbles With a Pinhole and a Hot Iron

The Problem

Veneered furniture that's seen moisture grows bubbles — spots where the thin face layer has let go of the substrate and lifted. The instinct on a flip project is to sand the surface flat, and that instinct ruins the piece: veneer is paper-thin, and sanding a raised bubble grinds through the face into the substrate before the bubble ever levels out.

The Technique

  1. With a utility knife, gently poke a small hole in the bubble. This is the escape route for the air trapped underneath — without it, ironing pushes the bubble around instead of down.
  2. Set a clothes iron on the bubble and press it down. The heat reactivates the original veneer glue beneath the face.
  3. Hold pressure as it cools so the veneer beds back into the softened glue instead of lifting again.
  4. Once it's down and cool, the surface can be sanded and finished like the rest of the piece.
Pro tip: Same-source bonus for furniture flippers: water rings and iron stains in bare wood respond to oxalic acid, and the cheap way to buy it is a canister of Bar Keepers Friend — used with a little water and fine steel wool, then neutralized with a baking-soda wash. It may take more than one pass.
Pro tip: Put a cloth between the iron and any finished surface you can't risk scorching, and start at a mid heat setting — old veneer glue reactivates well below an iron's top end.

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