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NateHanson 05-08-2007 07:25 PM

Primer for MDF?
I want to paint MDF with latex paint. What sort of primer do I need to use to keep the MDF from absorbing the water-based paint?

Would Kilz, or other shellac-based primer be appropriate?

NateHanson 05-09-2007 09:12 AM

Anyone with experience on this?

I've read elsewhere online that pro-finishers use MF Clawlock primer on it, but it looks like maybe shellac works ok. Can anyone verify this?

AtlanticWBConst. 05-09-2007 09:18 AM

Any kind of latex primer should do it....

NateHanson 05-09-2007 09:37 AM

But doesn't MDF swell up when it gets wet? I'd think a water-based primer would make a pretty rough finish.

J187 05-09-2007 10:13 AM

Nate - I painted a section of MDF with great success. I used Zinsser High Hide cover stain and then sherwin super paint top coat. Its been about 7 months and it still looks great.

I have installed car audio for 10 years and I can tell you not everything paints well over MDF. The High Hide worked great.

slickshift 05-09-2007 04:14 PM

I don't do much MDF

It's true, it does not paint well

When I have painted it, I've used an oil-based primer

I've used mostly Ben Moore's Fresh Start, but would trust Zinsser's Cover Stain (the Zinsser products are all excellent)
Especially after a recommendation by J87

NateHanson 05-09-2007 04:17 PM

I've got some zinzer, so I'll use that.

slickshift 05-09-2007 04:19 PM

...the Cover Stain is oil-based

NateHanson 05-09-2007 04:30 PM

Ah, I see. Ok. I'll look into that. I think of most of the zinsser stuff as being alcohol shellac based

slickshift 05-09-2007 04:46 PM

Just the B-I-N

J187 05-09-2007 04:51 PM

And the cover stain "high Hide" is what I used, its supposedly a little more heavy duty. I was actually surprised at how well it came out. It didn't have to be perfect, but it actually is.

slickshift 05-09-2007 05:49 PM
Oil-Base Primer-Sealer
Stain Killer Bond Coat

* Interior and exterior
* Blocks cedar & redwood bleed
* Use for fire, smoke & water damage
* Sticks to all surfaces without sanding
* Fast drying - recoat in 2 hours

High Hide Cover Stain is a high-performance, all-surface oil-base primer-sealer that offers outstanding adhesion and stain killing power and dries to recoat in 2 hours.

High Hide Cover Stain may be tinted toward the color of the finish coat to help the topcoat hide in one coat.

High Hide Cover Stain offers excellent flexibility and penetration making it ideal for exterior application to wood siding and trim. It seals surfaces with one coat offering excellent hold-out for enamels of any sheen.

Use High Hide Cover Stain for interior and exterior walls, ceilings, doors, trim, paneling, siding, window frames and shutters - any surface where a high-hiding, high-adhesion primer is desired. This all-surface low-VOC primer-sealer can be used over or under any oil or latex architectural paint and is ideal for water damage, fire damage and smoke damaged (including nicotine) surfaces.

Meets stringent SCAQMD Air Quality Standards for Specialty Primers, Sealers and Undercoaters.

Hamilton 05-09-2007 09:07 PM

We use Cover Stain 95% of the time in all our work, and 100% on wood/mdf. It will be a sad day when the government makes oil base primer go away.

slickshift 05-09-2007 09:09 PM

I already have to make banzai runs to New Hampshire for certain oil paints not legal for sale here

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