How to Paint cut MDF?


Postby EXAMP » Wed Jun 01, 2011 2:51 pm

I've cut some MDF for doors and have managed to paint the ultra smooth surface without any problem. Yet when I paint the cut edges, it looks ok for about 10 seconds then the paint dissapears.

Once dry you'd never know the edges had been painted.

I have used a specialist MDF paint on all surfaces.

How do I get paint to hold on the cut edge ?

Should I be using some sort of edging tape instead ?
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Postby Dan the man » Fri Jun 03, 2011 10:03 am

I remember painting some mdf last year and it did the same thing just dissapeared in 10 mins haha, if you paint it enough times it will eventually go the same colour as the flat surface, I think I painted mine about 6/7 times
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Postby chris_on_tour2002 » Sat Jun 04, 2011 11:00 pm

aah, this old chestnut. a common problem with MDF.

firstly use a decent paint system - absolutely forget the special MDF paints they are mostly useless in my experience.

use a water based wood primer - i'd recommend Dulux Trade - two coats, followed by two coats of Dulux Trade undercoat.

leave it for a day or two. if the paint begins to yellow apply a stain block such as Zinsser. i have found their shellac-based primer to be the best at preventing MDF yellowing. leave to dry then apply your finish.

i did this with my alcove bookshelving two years ago - i'm looking at them right now and they are as white as they day they were done :)
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Postby Sagalout1954 » Tue Aug 02, 2011 11:53 am

We had an MDF shelf cut along its edge into a 'wavy' design. We bought an MDF sealant from an ordinary DiY store, put 2 or 3 good coats of this along the cut 'wavy' edge so the top coats of paint could not be absorbed into the MDF.

Brilliant, worked a treat. Painting it no probs, the paint didn't sink into the edge and it still looks great 18 months later.
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Postby JRS » Fri Aug 19, 2011 6:45 pm

Coat 1st with primer when dry sand the rough edge really smooth and the second coat will take much better, This is the method i have used doing window contracts with mdf sils works perfectly.
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Postby TheDoctor4 » Mon Jun 02, 2014 10:53 am

Hi All

Have you seen our project on how to prepare and paint MDF as this gives a good run down on the process: http://www.diydoctor.org.uk/projects/mdf.htm
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