Thanks: 
Likes: 
Needs Pictures: 
Picture(s) thanks:
Results 1 to 6 of 6
Thread: Deep filling of MDF
-
3rd April 2015, 11:01 PM #1
Novice
- Join Date
- May 2012
- Location
- Sydney
- Posts
- 16
Deep filling of MDF
What is a suitable filler for moderately deep voids in MDF, say 2 cm? I am building a complicated loudspeaker baffle out of layers of MDF and need to fill some voids for a smooth overall appearance. The problem is that MDF is notorious for dimensional movement due to humidity and also loudspeaker vibration will also encourage cracking of the filler. Is there something that can fill to a moderate depth and not crack over time? Builders bog is too hard to shape and sand, and won't move with the MDF, hence likely to show joint cracks.
-
3rd April 2015 11:01 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
3rd April 2015, 11:06 PM #2
SENIOR MEMBER
- Join Date
- Nov 2010
- Location
- Perth W.A
- Posts
- 720
Why exactly are you getting large voids in mdf?
I have also never had problems sanding builders bog.
-
4th April 2015, 05:36 AM #3
Novice
- Join Date
- May 2012
- Location
- Sydney
- Posts
- 16
The MDF panels meet at complex angles and the tolerances are such that there are gaps needing filler.
Originally Posted by mark david
MDF is much softer than builders bog so tends to get sanded off leaving the builders bog proud. I would prefer it the other way round.
Normal wood fillers are ok for shallow gaps but shrink in larger gaps leaving a hairline crack which shows through any amount of painting prep. I am hoping there is something suitable out there, possibly similar to an automotive filler, but which bonds to MDF.
-
4th April 2015, 10:05 AM #4
GOLD MEMBER
- Join Date
- Oct 2014
- Location
- Caroline Springs, VIC
- Posts
- 1,645
If you dont want to use builders bog, I would make up a batch of mdf dust + glue. it will adhere to the mdf, and PVA has a bit of flex to it so it should take the vibrations from the speaker.
-
4th April 2015, 11:02 AM #5
SENIOR MEMBER
- Join Date
- Dec 2005
- Location
- Canberra
- Posts
- 3,260
Epoxy and MDF dust/other bulk filler. You won't pry that loose without explosives!
You can tailor the 'how hard to sand' part by using a marine epoxy and filler (in rough order) talc, flour, sawdust, aluminium powder, silicon carbide, diamond grit, or one of the proprietary fillers designed for easy sanding.
-
4th April 2015, 05:01 PM #6
Senior Member
- Join Date
- Jun 2007
- Location
- Queanbeyan NSW
- Posts
- 231
Off topic - Hones and stones
Epoxy and bulk filler Originally Posted by Master Splinter
Custom made stones and hones for moulding planes
I have been using diamond saws, cutters and burrs to reshape existing stones and pieces of slate "DUH"
How obvious is the solution when you look at things a different way
Got a couple of major tasks running at the moment, before the winter sets in, but will try this once I have walls on the workshop
Neil
Reply With Quote
Similar Threads
-
In The Deep End
By SHIPPERS in forum WOODWORK - GENERALReplies: 2Last Post: 29th August 2007, 11:22 PM -
In deep & ya don't know it
By John Saxton in forum WOODIES JOKESReplies: 1Last Post: 7th November 2006, 10:16 PM -
How deep do you let it get....?
By Stu in Tokyo in forum WOODTURNING - GENERALReplies: 26Last Post: 1st August 2006, 12:28 PM -
Deep..... very deep!
By Christopha in forum WOODIES JOKESReplies: 0Last Post: 28th April 2006, 10:21 PM
