|Home » Forums » Veneer Forum » Message||Login|
You are not logged in. Consider these WOODWEB Member advantages:
MDF edge showing up through finished veneer11/24
Hello, I finished a project about 2 months ago and i just started noticing the edge grain of the mdf raising the veneer around the edges. The project is a speaker and so it is a sealed cube.Its like the edges of the mdf are swelling, but i dont see how moisture could get in side the boxes. The veneer is not lifting off the mdf, just looks like it is swelling. any reason why or how this could happen. Thanks.
What is the glue that you used and how was the veneer applied? If you are positive that the MDF is not swelling due to the speaker getting wet than it could be that the veneer is shrinking and your glue line is allowing the veneer to move. Depending on where you are at in the country, the air is getting drier with the colder months and veneer wants to move. Your finish will typically slow this movement down but it will not completely prevent the dissipation of moisture.
the glue i used on the larger box was hot hide glue and the smaller boxes i used cold press glue. Which is really puzzling because they were two different methods but the same problem. The MDF is 3/4'' ,so from the edge to 3/4'' in from the edge all around the boxes are slightly raised. The edge it self is not separating. Dont know if that makes sense. The boxes did not get wet, they might have gotten damp, dont know if that could do it. But if the veneer did shrink would it only in the middle? is it ok to veneer over a butt corner like that or do i need to some sort of a mitered corner?
This might be what is called cold creep. However, it is puzzling that the same problem is happening over two differing application methods. The dampness might be an issue. Are the insides of the boxes sealed? Depending on how moist or damp the boxes got that moisture might be effecting it from the unsealed side causing the mdf to swell.
This seemed like an adhesive issue at first and might be a question for the adhesive forum.
The veneer will shrink across the whole surface but you won't notice it in the middle. You will only notice it at the edges. Veneering over butt joints should be okay as long as your joint is stable, secure and dead flat.
I wouldn't veneer over a butt joint of MDF that way. What you are seeing is telegraphing of the joint, just as you would if you veneered over solid edgebanding that was too wide, say anything over 1/4". I think you'd have a much better result if you miter the corners. I've mitered boxes like that, then ran a 1/8" rebate around it and glued in solid matching the veneer. Then you can radius or chamfer the corners nicely and have a more durable box.