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Darryl Keil

Last Activity 2024-10-10 3:42 PM
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bruce everett

Posts: 2

Joined: 2005-01-03

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Subject : Edge banding MDF
Posted : 2005-01-03 5:37 PM
Post #31957

I plan to edge band an MDF panel with veneer using Unibond 800 and want to know if the porous edges will create any problems. Does anyone have experience gluing on MDF edges?

Also what is the mixing ratio by weight for unibond 800? I can find it on the website. Last question, I have some unibond that is over a year old, how can I tell if it is still good.

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Richard

Subject : RE: Edge banding MDF
Posted : 2005-01-04 2:35 PM
Post #31959 - In reply to #31957

Hi, Bruce,
I have edgebanded a lot of MDF, but the technique I usually use is to press veneer to solid hardwood in the vac press. Then I mill the bands down to 1/16" (using Performax sander). Then I can glue and clamp the edge bands with most any woodworking glue. Having the veneer bonded to solid material gives me something less fragile than just a veneer. After you flush trim and process the panels, the 1/16" of solid material will be nearly invisible. I don't know if this would suit your application, but it might be worth a try.

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Darryl Keil

Posts: 1453

Joined: 2003-05-22
Location: Maine

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Subject : RE: Edge banding MDF
Posted : 2005-01-04 5:53 PM
Post #31961 - In reply to #31957

Bruce,

Richards approach is an excellent one and a good way to go.

If you wish to veneer directly to the MDF be sure to apply an extra heavy coat t0 the MDF edge as it really soaks up the glue. Even better is to apply a coat of the Unibond 800 to the MDF, let it soak in for a few minutes and then apply another coat. I also recommend veneering a double layer to the edge, often called a two ply. Pre-glue your edge veneer to another piece of the same species 90 degrees to this first layer. Press this first and then apply it to your edge.

Unibond 800 mixed by weight is 10 parts liquid resin to 1 part powdered catalyst. This information is right on the container. The liquid resin is no longer usable when it begins to thicken on itself. When it is fresh its the consitency of maple syrup, when it goes bad it will thicken to the consitency of cold honey. The powdered catalyst does not have a shelf life.

Sincerely
Darryl Keil

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bruce

Subject : RE: Edge banding MDF
Posted : 2005-01-04 8:13 PM
Post #31964 - In reply to #31961

Thanks for the info. I tried a test sample last night that showed the problems with MDF. The unibond soaked into the MDF so much that it starved the joint. There was very little adhesion. The veneer popped off when I pressed on the overhanging portion of the edgeband. I think I'll try letting one coat of glue cure completly to filled the edge of the MDF then veneer over that.

The unibond I have is the consistancy syrup so I guess it should be OK. The face gluing samples I did held very well. The substrate failed before the glue joint did. It's just the edges I'm having problems with.

Thanks again for the help,

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