Sanding MDF

The Weegie · Post by **The Weegie** » Thu Oct 23, 2008 8:32 am

I have made letters out of 18mm MDF.

The problem I have is that no matter what type of sand paper I use or how hard I sand I am always ending up with a rough edge at the sides.

I have used various grades of paper and also my rotary tool but still no smotheness. Is this fixable or is it just part of using MDF.

I have primed a couple of letters and then giving it 2 coats of acrylic.
The front and back are fine but the sides are still rough and fluffy.

Any ideas.

Cheers.

Mr Mike · Post by **Mr Mike** » Thu Oct 23, 2008 8:10 pm

The sides are always a problem, though the green MR MDF leaves a better edge.

For standard MDF, you'll need to paint the edges with PVA. When it's hardened, sand it back. Do the same again, then sand back again.

This'll leave you with a sealed, flat, smooth and paintable edge.

The Weegie · Post by **The Weegie** » Thu Oct 23, 2008 8:59 pm

Mr Mike wrote:The sides are always a problem, though the green MR MDF leaves a better edge.

For standard MDF, you'll need to paint the edges with PVA. When it's hardened, sand it back. Do the same again, then sand back again.

This'll leave you with a sealed, flat, smooth and paintable edge.

Cheers Mr Mike

carhartt kid · Post by **carhartt kid** » Sun Oct 26, 2008 12:02 am

Top tip mike!!!

Mr Mike · Post by **Mr Mike** » Sun Oct 26, 2008 9:45 am

Not just a pretty face you know.

Though some would say, not even a pretty face.....though compared to Yoda....I'm probably not that bad....

carhartt kid · Post by **carhartt kid** » Sun Oct 26, 2008 11:50 am

Yoda that its not, me a picture it must be!!!