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MDF Repair/Fix Mistake


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kevin doe 
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Posted: December 29, 2004 at 10:49 PM / IP Logged  

Hey guys and gals,

When using the router, my workpiece moved because I didn't have it clamped down tight enough.  Its a complex piece and I don't want to make another one.  How would you recommend fixing/filling in this slot?

MDF Repair/Fix Mistake -- posted image.

I thought about trying to use milled glass mixed in resin.  What would you guys use?

kevin doe 
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Posted: December 29, 2004 at 10:53 PM / IP Logged  

Oops, sorry about that bad link.  Try this:  The slot is 3/4" wide, and 1/4" deep.  Its in 3/4" MDF.

MDF Repair/Fix Mistake -- posted image.

kevin doe 
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Posted: December 29, 2004 at 10:55 PM / IP Logged  

That slot was supposed to be right along the edge of the wood, as to make a stepped edge.

Thanks,

Kevin

Alpine Guy 
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Posted: December 29, 2004 at 11:18 PM / IP Logged  
You can make a mixture of the mdf saw dust and wood glue to make a kind of bondo, , then stuff it in there.
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kevin doe 
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Posted: December 29, 2004 at 11:23 PM / IP Logged  

Would that be better than using the milled glass with resin?

Kevin

Alpine Guy 
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Posted: December 29, 2004 at 11:34 PM / IP Logged  
i have no idea at the moment what milled glass is, so im unshure
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kevin doe 
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Posted: December 29, 2004 at 11:52 PM / IP Logged  

This quote was taken from the place where I bought the milled glass.  www.aircraftspruce.com

"­As the name implies, this material is made by milling fiberglass into a very thin consistency. This material is used in preparing a structural filler. This material is used in fillets that require structural integrity. Milled fiber fillers have higher strength than cotton flock but have fine particles of fiberglass that can penetrate the skin."

What do you think?

When using the MDF sawdust, it seems mostly like powder.  After mixing it with woodglue, could I fill that whole slot at once?  How long would that take to dry?

Thanks,

Kevin

xtreamcc 
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Posted: December 30, 2004 at 1:19 AM / IP Logged  
use a fiberglass of sorts, either resin or that milled glass ur talkin about. It will bond with the wood and fill in the hole.
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Mja1962 
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Posted: December 30, 2004 at 8:02 AM / IP Logged  

You could also create a "patch" out of mdf to fill most of the groove & fill in the remaining areas with the MDF sawdust & glue.  Kind of like cementing a brick in place.  Of course, you'll have to thin out the piece first.  You could either glue it in or use screws.  Just make sure that the screws are not located in a way that they interfere with any other routing you may do.

-Michael

kevin doe 
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Posted: December 30, 2004 at 3:07 PM / IP Logged  

Here is what I did.  I mixed half a cut of resin and MEKP up.  Then I slopped a little bit in the slot to line it with pure resin.  Then I mixed a lot of MDF saw dust/powder into the resin in the cup.  After that I mixed it well and pasted that stuff in there.  Applied heat, waited for it to gel, then took a razor blade and cut it flush.  Then heated it till done.  Here is a pic of what it looks like now.  Should be plenty strong.

MDF Repair/Fix Mistake -- posted image.

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