something to finish mdf

[paulfk]

Hi all, sorry if this has been done but a search didn't turn up anything. I am adding another layer to the rear of my horns using mdf and would like to keep the mdf finish. What could I use to seal the mdf without changing the look of it.

 

[domtw]

It would be nice to see pictures of what you want to modify...

 

[paulfk]

Hi domtw, thats another story, I have started a thread about my horns in the fullrange section, its the Scalford horn. At present I just would like some info on what I can use to seal the mdf. I will post pics when the front baffle has been changed from the rough piece of mdf to something a bit nicer to look at. oh go on then have a look.

 

[Brett]

Shellac. Use dewaxed, and according to a woodworker mate, it can be painted over later if you choose.

 

[paulfk]

thanks I will look into that

 

[gedlee]

The shellac, which I use on MDF, will darken the MDF quite a bit. But it is a good sealer.

 

[infinia]

You could also use B-I-N primer (shellac based) color tintable and/or paint them in case you tire of the DIY look.

 

[MJL21193]

Clear polyurethane is an excellent sealer.

 

[infinia]

Hi
your camera has a lot a barrel distorsion, that MDF looks bent

 

[MJL21193]

looks bent

It is...

 

[domtw]

The panel is bent, OK.
When did you do the speaker opening ? before after benting ?
Any particular advise on this ?

 

[MJL21193]

Any particular advise on this ?

See here for some details.

 

[paulfk]

I'm not sure what you mean about the mdf being bent. If you are refering to the baffle that the driver is fixed to its not bent, it may out of square but is only temporary. The new baffle will cover the port opening and be made of hardwood. the picture was taken with a mobile phone and has been reduced due to the limited size allowed on this forum. The mdf I was talking about sealing will be on the back of the cabinet to increase its thickness

 

[domtw]

For the bent panel, we were talking about MJL21193's speaker...

So you want to add one front panel in real wood in the front and, an MDF Panel, in the back, is that right ?

For the front panel will it close the port (under the driver) ?
What was this port for ? I thought back loaded horns didn't need one...

For the sealing, MJL21193's advise is good.

Or are you talking about the glued contact between the original panels and the new ones ?

 

[paulfk]

the speakers were originally wharfedale pacific and I have turned them into horns, the port is no longer required so I intend to fill the hole with mdf or ply and then cover all with a hardwood panel.