What Primer for MDF???

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Old 02-04-04, 01:37 PM
platapus
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Question What Primer for MDF???

I made an 8' x 8' cabinet for a 225 reef tank finiched in MDF. My question is ...... What can I use to primer MDF??

I have a 1 ltr spray gun that runs off my compressor that I would like to be able to apply the primer with.

Does if mater if it is oil based or not, what are the pros and cons of oil based paint?

thanks
 
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Old 02-04-04, 02:43 PM
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I prefer latex paint due to the faster drying time and easier cleanup (water v.s. paint thinner). Others will probably disagree

I would use a good shellac based primer for your MDF. Spray on thin coats and allow some drying time between coats.
 
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Old 02-04-04, 02:54 PM
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Yeah sounds right to me. Use Zinssers BIN primer, and paint with latex.
 
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Old 02-04-04, 02:59 PM
platapus
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What about sanding between primer coats?
 
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Old 02-04-04, 05:03 PM
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Probably not necessary if you spray it evenly. What kind of finish paint are you using? A good enamel should smooth things out nicely.

prowallguy -

What part of StL are you in? I grew up about 40 mi west of there.

GO CARDS!!!
 
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Old 02-04-04, 07:09 PM
platapus
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I have been doing some research, I think that Im going to use polyester primer, 2 coats sanding 220 thru 320 betren coats?

Im not sure of the finish paint and gloss, I would like as shiny as possible black. I have a spray gun, so all will be sprayed on.
 
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Old 02-04-04, 07:40 PM
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Dave>> I'm in Florissant

Platapus>> Consider Benjamin Moore's Alkyd Hi-Gloss Enamel as a finish coat. It is very shiny and dries real hard after curing time.

I must admit I've never heard of polyester primer before.
 
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Old 02-04-04, 10:02 PM
platapus
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I will look into the Alkyd, is it easy to find?

Maybe Im misreading this...this is were I got the idea of polyester primer...

http://www.woodweb.com/knowledge_bas...er_primer.html
 
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Old 02-04-04, 10:03 PM
platapus
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The hard finish would be great, this is a 8' x 8' cabinet housing a 225 gallon reef tank 180gallon sump and 50 gallon surge tank, so a superior finish is ideal!
 
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Old 02-05-04, 05:16 AM
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platapus,

One primer coat should be sufficient!
Nothing will bleed through the mdf, so you only have to address the adhesion problem.

fred
 
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Old 02-05-04, 06:21 AM
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Platapus, I checked that link and it does look like the way you would want to go. It also said you can use any finish coat you want. Interesting stuff.

I would still say an oil finish coat would be more durable than latex, just make sure to give ample drying/curing time.

Alkyd is available everywhere, check with your local paint stores.
 
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Old 02-05-04, 08:36 AM
platapus
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prowallguy - thanks!


What problem is this?

Originally posted by fewalt
so you only have to address the adhesion problem.
 
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Old 02-06-04, 05:01 AM
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Adhesion question:

Primer serves TWO purposes.

1) it seals the substance being painted - normally wood.

2) a primer coat adheres better and accepts paint better so it is less likely to peel.


So, since mfd has no bleeding properties, (tar, gum, tannins, etc.), your primer for mdf is mainly for adhesion of the final coat.

fred
 
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