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Old 7th July 2014, 11:34 PM   #1
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Im building a second 54l sealed subwoofer cabinet, the first one I built I found a great woodworking website on what side to paint and what side to glue. I have since lost the article, I was curious if anyone can remember what side to paint (the smooth side or rough side) or happen to remember the website?
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Old 8th July 2014, 12:17 AM   #2
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Nope. But i wouldn't use MDF to build a sub.

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Old 8th July 2014, 12:26 AM   #3
chrisb is offline chrisb  Canada
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MDF sheets vary quite a bit in quality, and most of the brands we see in the commercial trade are smooth enough on both faces for paint finish.

That said, I generally don't use it in any of my speaker builds - except for jigs or grille frames - but that's a whole ' nother can of worms we need not open
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Old 8th July 2014, 03:02 AM   #4
NEO Dan is offline NEO Dan  United States
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OSB and Masonite have smooth and rough sides...
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Old 8th July 2014, 03:15 PM   #5
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I hand picked the best sheets but theres still kind of a fuzzy side and a smooth side, either way I will hit it with a sander before I paint it. I didnt if there was a preference?
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Old 10th July 2014, 03:55 AM   #6
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I'm not sure if that's what you are asking, but generally you want a fuzzy side to glue and smooth one to paint or varnish (this good also with MDF/HDF natural color).
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Old 10th July 2014, 04:30 AM   #7
NEO Dan is offline NEO Dan  United States
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Quote:
Originally Posted by Relic1Golf View Post
I hand picked the best sheets but theres still kind of a fuzzy side and a smooth side, either way I will hit it with a sander before I paint it. I didnt if there was a preference?
It's better to seal it before you sand so you are then just taking off the fuzz, then seal it again before you paint to avoid issues with humidity expansion. Best to seal it on the inside too.
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Old 12th July 2014, 02:55 AM   #8
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Brushed on sealer or sprayed?
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Old 12th July 2014, 01:53 PM   #9
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Quote:
Originally Posted by NEO Dan View Post
It's better to seal it before you sand so you are then just taking off the fuzz, then seal it again before you paint to avoid issues with humidity expansion. Best to seal it on the inside too.
+1, especially if you live in a humid area like I do. Also, seal all edges before gluing and use glue block construction on all exterior joints if you plan to spend mass quantities of time, effort, cost to get a fine/gloss finish.

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Old 12th July 2014, 02:04 PM   #10
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Quote:
Originally Posted by Relic1Golf View Post
Brushed on sealer or sprayed?
Depends on the coating manufacturer's recommendation. If it doesn't 'spell out' on the can the procedure for the specific material to be sealed, then contact them.

Second guessing a chemist is as much a 'fool's errand' as self diagnosing a major illness IMNSHO. Whatever you do, don't use shellac as a sealer as I've seen some recommend except as maybe a first pass to save $$$, it doesn't protect enough against moisture.

GM
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