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31st July 2023, 12:43 PM #16GOLD MEMBER
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- Nov 2007
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- melbourne australia
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- 2,585
I did see sand recommended somewhere, but surely the correct answer is proper clamping technique? I've been woodworking for forty years and never had to resort to salt or sand while gluing up.
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31st July 2023, 02:53 PM #17
I have used this method for years on PVA type glues and I was told the salt just dissolves, also I have not had a joint fail when adding salt, there just needs to be enough salt to cause resistance.
I would say it is most important to have your clamps at 90 degrees to what you are clamping, if you start to see creeping get another glamp and purposely offset it from 90 degrees so that when tightening it pushes the creep back into alignment.
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31st July 2023, 04:25 PM #18SENIOR MEMBER
- Join Date
- Aug 2020
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- Sunshine Coast
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- 638
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31st July 2023, 04:27 PM #19
Check that it is not the Merbau. This has much natural oil, and often will bleed tannin. Either first wipe it down with meths, or use epoxy.
Regards from Perth
DerekVisit www.inthewoodshop.com for tutorials on constructing handtools, handtool reviews, and my trials and tribulations with furniture builds.
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1st August 2023, 08:03 AM #20GOLD MEMBER
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- Oct 2018
- Location
- Dandenong Ranges
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- 1,845
Hi JMcB. A little while ago I had some annoying glue failures when using spotted gum. Doing my research here, most recommended wiping down with acetone just prior to applying glue. I did this recently when gluing up an unknown eucalypt and all worked out fine.
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1st August 2023, 09:37 AM #21Senior Member
- Join Date
- Jun 2018
- Location
- Brisbane
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- 281
I was beaten to the punch - Acetone is my preferred pre-treatment for oily/problem hardwoods. Quick wipe with a rag, it'll evaporate within 30 secs and takes the oil out of the wood...
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1st August 2023, 10:31 AM #22GOLD MEMBER
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- Jun 2003
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- Sunbury, Vic
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- 85
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- 2,103
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1st August 2023, 09:51 PM #23GOLD MEMBER
- Join Date
- Aug 2004
- Location
- Perth WA
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- 1,621
Is the failed joint pulling out timber or is it failing clean with no timber breakout? You haven't really described what is happening.
Experienced in removing the tree from the furniture
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3rd August 2023, 11:12 AM #24... and this too shall pass away ...
- Join Date
- May 2012
- Location
- Brisbane (Chermside)
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- 71
- Posts
- 2,042
If there is no timber tearout and the glue join itself is failing resin in the timber could be the culprit.
Some advocate wiping down the joint with acetone just before glue-up. I prefer to use a PU glue, like Titebond Polyurethane Liquid Glue. Sometimes the colours give away the presence of resins. In NG Rosewood, the red colours also indicate resinous timber.
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3rd August 2023, 01:10 PM #25GOLD MEMBER
- Join Date
- Aug 2011
- Location
- bilpin
- Posts
- 3,165
One thing that hasn't been mentioned here is the jointer. Some timbers form a very slick surface off a planer. Merbau is one of them. The blunter the blades the more burnished the timber. Add to this the waxy nature of the wood and you have a difficult gluing surface. Acetone will help with the wax but not the burnish. For those types of timber I prefer to glue up off the saw and a wipe down with acetone.
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1st November 2023, 10:17 PM #26New Member
- Join Date
- Nov 2023
- Location
- Brisbane
- Posts
- 3
Hi Mate,
Did you end up getting positive results at all? If so, what did you change/find that was your issue?