Please Help: Tips For Prepping MDF For Paint - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 8 Old 09-08-2017, 08:56 PM - Thread Starter
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Please Help: Tips For Prepping MDF For Paint

I purchases four 2cuft sealed enclosures from DIYSG for my four Infinity 1262 drivers to use as nearfield subs. It took forever but they've been assembled. I assembled everything except the second outer baffle so I could laminate the other 5 sides, then glued the outer baffle to the front. Since the edges are rounded over ill need to paint them. I understand the edges routed for the roundover need to be prepped so they don't absorb the paint. What products and/or techniques are recommended?

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post #2 of 8 Old 09-08-2017, 09:33 PM
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lots of options.


here is one: http://www.hificircuit.com/community...er-thread.609/


see post 20.
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post #3 of 8 Old 09-08-2017, 09:50 PM
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another option is to hit it with 2-3 coats of shellac, sanding in between coats with something around 150 grit. the goal is two-fold: 1. to fill in the end grain and 2 to seal it up.





high build primer is a third option.
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post #4 of 8 Old 09-08-2017, 10:34 PM
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Just looking at my raw MDF cabinet and thinking it would be good to stain, then shellac..........especially like yours with no raw ends....

Never stained MDF, but it looks like it would accept it well and evenly....maybe ?
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post #5 of 8 Old 09-09-2017, 05:38 AM
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What I have used for this purpose is Unibond Wood Glue diluted 1 part to 5 (or up to 10) parts water. Stir the mix thoroughly then simply paint it on and it will seal the wood allowing paint over it. Wash brushes immediately with water. You probably already have the glue to hand and need very little for this particular finishing job. Simple clean, non-toxic, easy and does a good job to boot.
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post #6 of 8 Old 09-09-2017, 07:46 AM
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Please Help: Tips For Prepping MDF For Paint

What I do to every box is sand it down to 220 grit sand paper and paint the box with tinted primer that I buy from Sherman Williams or menards. Next I sand after a few coats of primer go on and a few coats of the final paint. The sub box looks good afterwards.
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post #7 of 8 Old 09-09-2017, 09:00 AM
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water on end grain can lift the grain. along hard edges and on corners, the problem is the worst.
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post #8 of 8 Old 09-23-2017, 02:50 PM - Thread Starter
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Ok. I applied diluted wood glue 5:1, sanded, then applied diluted wood glue 10:1, then applied oil based primer from a rattle can. Now I'm ready to spray black paint. I've never sprayed before but I have an Earlex HV2901P Spray Station. It came with a 2.5mm tip but I'm wondering if that's too course. Should I order a smaller tip for this application (a subwoofer baffle)? Also, the black paint is a latex high gloss from Sherwin Williams. I presume it should be diluted. Any recommendations for how much it should be diluted for a given recommended tip size?

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