JoeWoodworker
JoeWoodworker Veneer
The Official Website of this Non-Professional Woodworker ™

Part 1
Introduction

Welcome
Veneering Basics

14 Good Reasons
Vacuum Press Uses
Vacuum Press Options
Overview

Questions & Answers
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Part 2a (Option 1 of 2)
Project: V2 Venturi Press

About Project: V2
Parts List
Build the Manifold
Build the Reservoirs
Assemble the Venturi
Make the Carrier
Wire the Press
Testing and Adjusting
Mods and Options
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Part 2b (Option 2 of 2)
Project: EVS Pump Press

About Project: EVS
Parts List
Pump Selection
Build the Manifold
Build the Sub-Manifold
Build the Reservoirs
Make the Carrier
Final Assembly
Wire the Press
Testing and Adjusting
Mods and Options
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Part 3
Vacuum Bagging

Vacuum Bag Basics
Polyurethane vs. Vinyl
DIY Vacuum Bags (A)
DIY Vacuum Bags (B)
Connect the Bag
Bag Closures
Bag Platens
Breather Mesh
Maintenance
DIY Frame Press

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Part 4
Veneer Information

About Veneer
Veneering Glossary
Veneering Myths
Backer Veneer

Veneer Glues
Veneering Tips
Substrate Materials
Flattening Veneers
A Sharp Veneer Saw
Jointing Veneers
Taping Veneers
Dealing with Defects
Curing Glued Panels
Veneering w/o Vacuum
Hammer Veneering
Iron-On Veneering
Veneer Storage
Amazing Bookmatches
Copper Veneer Guide
Paperbacked Veneer

Edgebanding Guide
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Part 5
Miscellaneous Info

Vacuum Forming
Vacuum Chucking
Vacuum Clamping
Vacuum Clamp Matrix
Vacuum Infusing
DIY Vacuum Manifold
Vacuum Press Gallery 1
Vacuum Press Gallery 2
Veneering FAQ
Veneer Glue FAQ
The Vac FAQ
Copper Veneer FAQ
Downloads (PDF's)

VeneerSupplies.com

Vacuum Veneering - Tips, Tricks, and More

Curing A Glued-Up Panel - Tips to Prevent Warping

Most types of cold press glues require only 1 hour in the press to set the bond between the veneer and the substrate. However, the actual curing of the adhesive can take several hours once the panel is removed from the vacuum bag. Don't make the mistake of leaving a veneered panel in the vacuum bag for longer than an hour if you are using a standard cold press veneer glue. Learn more about this concept here.

Here's a rookie mistake that I've made more times than I should even mention. When you've finished pressing the veneered panel, don't be tempted to take it out and toss it on the workbench. The glue on the top surface will continue to dry while the underside, being starved for air, will remain uncured. This will result in a warped panel. Even thick substrates will warp if cured incorrectly!

The warping happens when the veneer (which has slightly expanded from the moisture of the glue) begins to shrink as the adhesive dries and cures. The glue has its grip when the panel begins drying so it is pulling the project board in the direction of the shrinking movement. When the pull is even on both sides, the panel stays flat. Think of it as a race between both sides of the panel. You want both sides to arrive at the finish line at the same time.

After removing a glued up veneer from the press, store the panel on a flat surface with ½" dowels or ½" PVC pipe under it and space them 8 to 12 inches apart. Wait at least 4 hours for the glue to fully cure. If you are extra worried about the panel not staying flat, then place additional dowels on top of the veneered panel with a scrap board on top. This will even out the curing speed of the glue so that both sides dry at the exact same rate.

  • For drying a smaller panel, use a few spring clamps to suspend the veneered panel from a ½" dowel, as shown.
     
  • Generally speaking, thinner substrates warp faster and more perceptibly.
     
  • Substrates less than ½" will warp slightly if they are not finished or at least framed in a wood border within a few days of pressing. You can also keep the panel flat by placing it on a flat surface with a flat board and some weight on top.
     
  • If you have no immediate use for a veneered panel but choose to make one anyway, allow it to cure for a day and then store it between two flat boards. This will minimize any warping.
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