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Old 18th November 2012, 08:53 PM   #11
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You could use the V-groove as a design element -- or any router bit.

Why not just veneer the surface.
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Old 18th November 2012, 09:19 PM   #12
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I would veneer the surface and then paint that. The mdf edges on the front baffle will probably always show. (expansion and contraction due to heat and moisture changes will be different across the thickness and the width of the mdf) The worst thing about mdf is any sawn/machined edge.
If you veneered the speakers in a smooth melamine it would provide a very flat and even surface to paint as long as the correct primers were used. But of course you can get some good looking finishes with melamine. Do the front baffle in melamine/formica and paint the rest! Or maybe get some really nice wood veneer for the front and then paint the rest.
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Old 18th November 2012, 10:23 PM   #13
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Don't use latex paint on MDF without sealing first with oil based, or shellac, or just use oil based paint.
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Old 20th November 2012, 10:49 AM   #14
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http://http://www.mkt-gmbh.com/alpha...pe.php?lang=en

How about this for another option. could be rebated up to the join line.

had trouble posting this link. remove the extra http:// to view.
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Old 21st November 2012, 02:11 AM   #15
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The secret is in the paint. I seen a large desk made of MDF primered and three thick sprayed coats of two-part polyester. The desk was then sanded and polished to a perfect mirror finish. Make tight joints to begin, fill cracks with bondo, sand well, prime and paint. Absolutely no chance of photographing!
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Old 21st November 2012, 08:10 PM   #16
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Quote:
Originally Posted by cochleus View Post
The secret is in the paint. I seen a large desk made of MDF primered and three thick sprayed coats of two-part polyester. The desk was then sanded and polished to a perfect mirror finish. Make tight joints to begin, fill cracks with bondo, sand well, prime and paint. Absolutely no chance of photographing!

you mean telegraphing - anyone successful with a high quality paint job on MDF speaker enclosures would likely to want to share the results with photographs
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Old 21st November 2012, 11:04 PM   #17
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Well, "photographing" is the term I have always heard used for that particular problem. I didn't see anyone take pictures of the desk, but it was an awesome finish. Very expensive and difficult to apply though. The spray gun must be flushed with acetone between coats.
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Old 21st November 2012, 11:08 PM   #18
chrisb is offline chrisb  Canada
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Originally Posted by cochleus View Post
Well, "photographing" is the term I have always heard used for that particular problem. I didn't see anyone take pictures of the desk, but it was an awesome finish. Very expensive and difficult to apply though. The spray gun must be flushed with acetone between coats.

"telegraph" is a trade term for flaws in substrates showing through thin veneer or paint / finish top coats, the rest was a play on words - as I said, as much as it's generally not to my personal taste, a high quality paint job on MDF is something many would consider worthy to be shared
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Old 21st November 2012, 11:12 PM   #19
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The biggest problem is it takes a lot of time. If you don't wait until the primer is completely cured, even if you sand flat before the next coat, it's gonna sink when the previous coats "dry" and shrink. If you're in a big enough hurry you can make several coats of primer still show the joint. If time is one of the things you certainly have, you can wait a couple-few 70+ degree F days before sanding a coat of primer.

Last edited by Andrew Eckhardt; 21st November 2012 at 11:14 PM.
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Old 21st November 2012, 11:27 PM   #20
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The finisher first applied a "wash coat", which is a primer. Then he sprayed two thick coats of two-part polyester the same day. Then, it took him two days to sand the finish out and polish it using a random orbital.
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