MDF vs Baltic Birch

Woodworks by John

Woodworks by John

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I'm designing a frame that will have a panel around the painting somewhat like a tabernacle. This will be oil gilded, my question is whether to use MDF or Baltic Birch plywood. I've used both and the MDF is very smooth and stable but wondering about the stability of it. Any thoughts? Over-all size of it approximately 1/4" thick and 15" x 20" and will be enclosed in a wood frame. Thanks -- John
 
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Is it real Baltic Birch, or Vietnamese made? It makes a difference in the quality of the inner plies and voids therein. If not marked as such, VN are available in standard 48" X 96" panels, and the genuine article is usually metric and the panels are square ( 1.5m X 1.5m~60" X 60"). VN is the same wood, just not made in the Baltic region.
Not a big fan of MDF, even in my cabinetmaking days we stuck with plywood. We have humidity concerns that might not be an issue for you.
Is Basswood off the list?
 
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We usually choose Baltic Birch for any work that is structural in nature and MDF for projects that require a smooth surface for finishing. If we are being really picky about needing a panel with a consistent surface both in smoothness and flatness we would go with Plum Creek MDF. One of the highest quality MDF panels and they also offer a version that is formaldehyde free. I'm sure you are aware: to avoid cupping and maintain flatness be sure to counterbalance and apply similar finishes to both faces.
 
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At 1/4' thickness I would be looking at the best quality plywood I could find. If it is not smooth enough could you coat it with a suitable sizing product?

I have used MDF extensively for backing cheap posters etc and know how quickly it reacts to moisture. It will bow if hung on an outside wall or one adjacent to a bathroom and even react to major changes in temperature and humidity so I definitely would not trust it for the kind of work you are planning.
 
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That's the problem I'm facing, only source carries only full sheets. The plan is to apply several coats of seal shellac, then yellow burnisher/sealer, and slow set size prior to Dutch gold. It will be put into another frame which will help with stability, similar to framing a painting on panel. Woodworkers source sells a 69 square foot pack and ships for about $70.00 but not sure if it's import or better quality.
 
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