MDF Repair/Fix Mistake

Printed From: the12volt.com
Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=46344
Printed Date: April 29, 2024 at 4:45 AM

Topic: MDF Repair/Fix Mistake

Posted By: kevin doe
Subject: MDF Repair/Fix Mistake
Date Posted: December 29, 2004 at 10:49 PM

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?

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

Replies:

Posted By: kevin doe
Date Posted: December 29, 2004 at 10:53 PM

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

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Posted By: kevin doe
Date Posted: December 29, 2004 at 10:55 PM

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

Thanks,

Kevin

Posted By: Alpine Guy
Date Posted: December 29, 2004 at 11:18 PM

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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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.

Posted By: kevin doe
Date Posted: December 29, 2004 at 11:23 PM

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

Kevin

Posted By: Alpine Guy
Date Posted: December 29, 2004 at 11:34 PM

i have no idea at the moment what milled glass is, so im unshure

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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.

Posted By: kevin doe
Date Posted: December 29, 2004 at 11:52 PM

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

Posted By: xtreamcc
Date Posted: December 30, 2004 at 1:19 AM

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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"Shiny chrome when used in conjunction with bikini models is particularly effective in inducing brain deficit disorder"

02 Jeep Grand Cherokee

Monster System on its way.

Posted By: MJA1962
Date Posted: December 30, 2004 at 8:02 AM

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

Posted By: kevin doe
Date Posted: December 30, 2004 at 3:07 PM

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.

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Posted By: MJA1962
Date Posted: December 30, 2004 at 3:16 PM

Looks good! That definitely should do the trick.

Posted By: bluetruck
Date Posted: December 30, 2004 at 5:54 PM

good work.

Posted By: kevin doe
Date Posted: January 01, 2005 at 4:22 PM

Here I have routed the edge how it should have been in the first place. The resin/MDF mix routed well, but it severly dulled the carbide edges on the router bit. Here is a pic of the routed edge.

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Kevin

Posted By: kevin doe
Date Posted: January 01, 2005 at 4:24 PM

Lets try again.

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Posted By: satfrk32
Date Posted: January 01, 2005 at 9:59 PM

kevin: correction on link...add your type with adress

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