MDF panels

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Forum topic by JCantin posted 11-05-2013 09:22 PM 810 views 0 times favorited 1 reply Add to Favorites Watch
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179 posts in 3437 days

11-05-2013 09:22 PM

Topic tags/keywords: mdf primer

I’m doing a frame and panel wainscoting project in my dining room.

The frames are built already using poplar. Before applying them to the wall I sanded them down to 220 and sprayed them with B-I-N shellac-base primer using my HVLP. Then sanded them to a nice smooth surface.

I’m planning to use a good quality acrylic interior semi-gloss enamel over everything.

Now its time to prep and install the panels. My questions are:

1. MDF vs. Hardboard. Is there any reason to use one or the other? Since the edges will be hidden I don’t have to worry about edge sealing the MDF. Would hardboard give me a better finish though?

2. Priming. Can I use the same B-I-N as primer for the panels?

3. Sanding before priming. If I use MDF is there any point in further sanding before priming?

4. Sanding after priming. I assume a light sand with 320 or 400 would help the final finish?

5 Spray vs brush. I used my HVLP gun to apply the B-I-N on the poplar. Should I go that route for the panels too?

Thanks in advance for any advice.

1 reply so far

View tefinn's profile


1222 posts in 2462 days

#1 posted 11-07-2013 03:02 AM

1. I’d go with the MDF. The hardboard doesn’t offer any real advantage and the MDF is probably cheaper.

2. You can use the same primer. It’s actually best to use a shellac sealer like B-I-N on MDF.

3. I don’t sand before priming since it just opens the surface (lots of fuzzies) making it harder to seal.

4. A light sanding will help get a smoother top finish.

5. If you want to spray the panels that’s fine. Helps with a smoother, easier application.

Are you going to spray the finish coat on also?
Make sure you post some pics when you’re done!

-- Tom Finnigan - Measures? We don't need no stinking measures! - Hmm, maybe thats why my project pieces don't fit.

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