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Thread: Repair finger join
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6th October 2013, 03:54 PM #1New Member
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Repair finger join
Hi,
I hope someone may be able to help me. I have a finger join in a window sill that I need to paint. I have attached a couple of photos to show the join.
I need to paint the window surround but need to repair this first. Is there a glue / adhesive that will fill this joint and not split again after painting.
Any help would be much appreciated.
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6th October 2013, 04:32 PM #2Skwair2rownd
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Polyurethane glue will do the job.
Push it into the joint - Make sure to use a glove - let it cure and the it can be sanded back.
If you haven;t used PU before now, be aware that it expands and sets so it looks a bit like PU
foam.
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6th October 2013, 07:30 PM #3Taking a break
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The only reason PU expands is because of the gas bubbles created from the reaction with moisture in the timber (which is how it works) being trapped as it sets. It's not designed to fill gaps.
I'd be going with epoxy resin instead
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6th October 2013, 09:26 PM #4Senior Member
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Bit of 15min epoxy should fill that, try adding a bit of talc to thicken it up a bit.
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7th October 2013, 09:26 AM #5Skwair2rownd
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7th October 2013, 10:29 AM #6
I think that Builder's bog and similar polyester resin based fillers really don't have a role in anything to do with wood (or metal for that matter) as the adhesion isn't that good. Better off paying a bit more and using epoxy, as the price difference isn't that great. To increase the chances of the fix holding over time I'd use a syringe to see how much I could force in there.
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