How to Varnish mdf?

by Tony
(london, UK)



Is it possible to varnish mdf?


Hi Toni,

Instead of adding a new comment I decided to answer your question here.

MDF or medium density fibre board can be clear coated. I myself wouldn't apply varnish as it tends to yellow over time.

You may need to use a sealer before the coating goes on (could take a few applications). After sealing the wood apply at least three coats of water-based Varathane (sanding between coats).

Keep in mind though that, products you use does depend on your particular MDF since it's made with an assortment of manufacturing procedures.

Some wood workers suggest applying chemicals like Toluene, Mek, or Xylene along with a suspended wax as the best coating for MDF due to the MDF absorbing coatings in different ways (blotchiness). This might be true but such solvents are highly flammable and very dangerous to ones health.

Prior to starting, test you sealer and coating process by using the same type of MDF that your project is made from. If in the end your not happy with the finished test you might need to throw on some paint instead.

Remember to ask your local coating and building materials supplier for advice regarding the process of coating the specific kind of MDF that's sold in your area.

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mdf (fiberboard) back prime?

by Chris

I am about to prime wainscoating made of MDF,is there any reason to backprime?

Is this a good process ?
The MDF is not installed.

1) prep and prime (enamel undercoater applied with brush/roller 3/8" (2 coats)
2) sand-Apply one coat of latex finish paint
3)install wainscoating to wall
Apply top coat of latex finish paint.

Thanks, any guidance you may have will be greatly appreciatted.

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Painting melamine MDF shelf

by Debra

I bought a bathroom shelf at the local Menards. The finish is smooth and very bright white. Can I repaint the shelf (creamy cottage white color) without ruining the piece? I thought I could sand gently and prime then paint. Sound like a good idea?

Thanks for your help.

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MDF clapboard house exterior

by Edgar
(Candia NH)

I need to repaint my house I'm scraping then sanding the edges of the scraped areas, i have a sherwin willams paint that has primer in it and I am going to spray paint with an airless system. does the paint sink in to the mdf? should I wait for cooler days it's about 865 & humid right now, I tried a brush but it is drying as I'm putting it on. Edgar

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OSB Board

by Missy

Hi! Any suggestions on painting OSB inside SIP boards? I have a tall ceiling and want to paint them before they go on the roof. A friend did theirs 8 years ago with sand paint and it still looks great. He can not remember if he used primer, and suggested that I leave the edges bare so they could be taped or mudded to eliminate the seams. Do you think texture paint is the best solution? Thank you for any advice you have.

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Bubbles in the wood
grained paper on furniture

by Diana

I bought a piece of furniture that is covered in a wood grained type of paper. There are a few bubbles in the paper itself.

I would like to prime the entire piece of furniture then paint it black.

Any help you could give me before I start my project would be great.

Also, is it possible to get rid of the bubbles !!!

Appreciate any assistance.

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Is there urea formaldehyde in mdf

by Leigh Ann

Hi, i was reading one of your online articles, thanks for the advice. i do have a question.

i am using mdf board to make a bed for my son. i read that it is made with urea formaldehyde, will this be safe for my son to be laying in every night???

i am putting magnetic paint on as a primer coat and covering it with chalkboard paint, the sides will come up so he will kinda be surrounded by the bed.

thanks for your time and help.

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Changing colors on an mdf painted surface

by Debs
(Southampton)

I painted mdf a while ago with a pale blue emulsion.

I'm wanting to change the colour to a white emulsion. I'm having problems with the paint sliding and it's patchy looking.

I tried using a paint roller which left the surface stippled. A brush also seems to slide the paint around instead of staying in place....help.

What is the best paint to use?



Hi Debs,

If you have smeared paint marks (or a heavy stipple) you'll need to lay on some filler to fix the problem first.

I find that Dap Drydex spackling compound works the best for filling. After the Dry dex is dry sand it (apply more if needed).

Your now ready to give your mdf a good consistent sanding (120 grit sand paper) followed by an application of a high quality bonding Primer.

Once the primer is dry lightly sand it then brush/roll on at least two coats of premium paint (lightly sanding between coats).

Regards,
Shawn.

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