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covering speaker boxes buld with 3/4 mdf with 1/8 or 1/4 oak ply ideas for glue. wood glue, epoxy, etc ?
Follow Ups:
Good old yellow carpenter's glue should be fine. Or you could use contact cement but once the pieces are put together, that's it. The carpenter's glue is a little more forgiving since you have some working time before it sets. I'd also have plenty of clamps and some lengths of 2 x 4's. Apply the cement evenly (do not dilute with water) using a trowel with small notches (around 1/8" or smaller). Set the oak ply on top and cover with another piece of 3/4" MDF approximately the same size as the first. Carefully align the edges. Take several 2 x 4's about 6" longer than the MDF is wide and place them on edge about 6" apart, under and over the MDF. Make sure to have 2 x 4's on the ends of the MDF/oak ply sandwich. Clamp securely until a small amount of glue seeps out from the edges. Allow to dry overnight. When dry, scrape the edges with a paint scraper to remove any excess glue and size the piece on the table saw.
A few embellishments:
Nothing to be gained from yellow glue; the white carpenters glue has a longer open time, BUT, both will allow the veneer to move around an amazing distance as you tighten the clamps,
therefore, begin clamping in the middle with light pressure. Move to one side 6" and set another set of clamps and th4en move to the other side of center and so on, checking as you do each that the veneer hasn't moved. When you have all the 2X4's calmped. go back and tighten but not too much; don't want to force the glus away from the workpiece.
A rubber "J" roller sold the flatten laminate (which it is poorly suited too) makes a great way to evenly distribute the glue. Roll East to West, North to South and then diagonal.
The 2X4's should be planed so that the ends are 1/8" less thick than the middle. With the planed side down they should rock slightly on the workpiece. then when you tighten the clamps the middle will be forced down more than it would without the taper.
The piece of MDF or ply you use bewteen the veneer and the 2X4's should be 2- 3/4" layers thick. Physics at work: distributing the load.
Get some brown "builders paper" at the hardware store to put between the veneer and the double thick 'platen'. Absorbs any bleed thru of glue and keeps from gluing the veneer to the 'platen'.
Have many "longnecks" at hand; it's thirsty work.
thank you,
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