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28th May 2014, 08:54 PM #1Intermediate Member
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Trouble with diggers casting resin
Hi there,
I am currently attempting to use diggers casting resin to fill voids, defects, cracks etc in a hall table top (olive wood). I left the resin to cure for 6 days but when i attempted to sand it back with the belt sander i ran into a problem.
The resin would sand reasonably well until about halfway through the puddle, where it would start to get tacky and eventually just rip out. Can anyone hint as to what the problem may be? Not enough hardener or too much? If anything, i would have over catalyzed the batch of resin.
This is the first time i have attempted to do anything like this so any help is appreciated.
20140522_181419.jpg
The top
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Successful attempt
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20140528_174631.jpg
20140528_174700.jpg
Failed attempts where the resin has been ripped out.
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28th May 2014 08:54 PM # ADSGoogle Adsense Advertisement
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28th May 2014, 10:15 PM #2
I am not an expert but my guess is that as you have sanded the resin and belt have hot causing the resin to soften, the timber to move and out it has come.
No doubt someone will explain what is happening shortly.
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28th May 2014, 10:55 PM #3GOLD MEMBER
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You are partly right, in that the belt has gotten hot and melted the resin, pulling it out, the timber would not have moved.
Diggers is not the best for filling in voids in timber. Contact Brendan Stemp for some resin that is ideal for filling voids in wood .
Sambo, the best way to flatten the top after filling, would be with with a router, set up on some parallel boards using a really sharp cutter.
Kryn
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28th May 2014, 11:01 PM #4GOLD MEMBER
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My uneducated guess is that you have used too much of the mixture in the one pour.
Probably better off building up deep voids in layers, maybe a couple of millimetres thick, and allow to thoroughly harden before placing another layer.
As to the current dilemma, maybe it hasn't fully cured. If possible, can you drill a small hole (1.5mm dia.) into the deepest void to check if the resin is fully hard?
Alan...
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29th May 2014, 12:12 AM #5GOLD MEMBER
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Epoxy
I would use epoxy resin mixed with wood dust.
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1st June 2014, 11:38 PM #6
I've used diggers quite a few times to fill voids. I think you've probably not used enough catalyst.
TravSome days we are the flies; some days we are the windscreen
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4th June 2014, 09:57 AM #7Intermediate Member
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Cheers for all the replies.
I tried the router on boards idea and it worked a treat, wasnt tacky in the middle of the puddles and didnt leave any residue on the cutter at all. I will be using this method from now on.
Trav, how do you flush the resin off with the timber? Any problems?
It has been very cold overnight and in the mornings here in SA in the last fortnight so this may also be a factor.
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4th June 2014, 09:42 PM #8
I just sand it flush. I make sure the resin is pooled above the surface of the timber, then I let it set (at least overnight) and then sand it flush. Never once had a problem.
Some days we are the flies; some days we are the windscreen
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6th June 2014, 08:37 AM #9Intermediate Member
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I think it may be the timber. Olive being very oily. I let the last batch cure for 6 days and still had the same problem. I definitely over catalyzed this last batch. I'm going to try another product and see if that works any better. Another option may be to soak acetone in to the area and let it dry before applying the resin.
This last batch was rock solid but was still tacky where it came into contact with the timber.
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