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Subject: Re: Plastic resin joint failure

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Message Thread:

Plastic resin joint failure

11/27/21       
Dave Edgerton  Member

Glued up some solid walnut with plastic resin which was fresh and good. Clamped for 12 hours. Glue line failed in a few of the laminations
The glue in the failed joint seemed crystalline like sugar, any suggestions?
I was thinking to spread the glue on both surfaces and wait a few minutes and then spread to allow it to soak into the wood fibers. I will add more heat with a blanket or something. Just need a list of what to watch for. Thanks

11/28/21       #2: Plastic resin joint failure ...
Tom Gardiner

If imy memory is correct you are in Sask. The first culprit for PPR is too cold to cure property but that would be for all the joints. What was the temperature of the shop. I think the glue requires 70° F something like 18° C

11/28/21       #3: Plastic resin joint failure ...
Dave Edgerton  Member

Tom, that is one of my suspected issues. Going to repeat with more heat.

11/29/21       #4: Plastic resin joint failure ...
David R Sochar Member

I gave up on plastic resin glue due to temp issues. Not only thermostat, but wood, glue, water all need to be at temp or well above. A few joints held, but could not be trusted.

I wish we could use it, but we keep the shop between 63 in summer to 68 in winter.

12/2/21       #5: Plastic resin joint failure ...
GARY

I mix it with warmish water and I would leave it 24 hours in the clamps.

12/13/21       #6: Plastic resin joint failure ...
John Member

Yes, you need a minimum of 70F for the glue, wood, etc. You also need significant clamping pressure. I've never had any problems as long as I make sure to follow the spread recommendations, minimum temp. and clamp well. You can use an electric heating blanket or heat lamps to keep things warm, even if your shop is cool. Also, you only need to apply glue to one surface as long as you follow the spread rate. The correct spread rate will give little bubbles of glue at the edges of the parts. No bubbles is too little; big gobs of squeeze out is too much.
John

12/13/21       #7: Plastic resin joint failure ...
GARY

There's a great wood propeller maker that I watch sometimes on Youtube. She inherited the business from her Grandfather. All she ever uses on her propellers, just as her Grandfather did, is plastic resin glue.

2/2/22       #8: Plastic resin joint failure ...
John Member

FWIW, Weldwood Plastic Resin Glue has not been manufactured "for several years" I was told when I contacted DAP a couple of weeks ago.

I'm using Unibond 800 now - no issues so far, and easier clean up. Soap and water is all it takes.

John

2/2/22       #9: Plastic resin joint failure ...
GARY

Thank you for the update John. I just purchased some DAP Plastic Resin Glue so I suppose they are just selling off what is left ?
What is the water-resistant qualities of the Unibond ?
Gary

 

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