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Author Topic: Glue test. Gorilla/Flex/Loctite/JB Weld Youtube.  (Read 4907 times)

Brian60

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Re: Glue advice
« Reply #25 on: December 30, 2018, 03:10:05 PM »

I watched that video xmas day (ok I was bored!) I like the attempt to glue a cylinder head down with the JB Weld and no bolts :D But it did show as the best epoxy. I've since watched a couple more in his series, the penetrating fluids, the superglues etc. Interesting videos but I must say not conducted scientifically. I've had some counter results to what he found with some of what he has tested. At the end of the day its got to be down to what works for you.

tigertiger

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Glue test. Gorilla/Flex/Loctite/JB Weld Youtube.
« Reply #26 on: January 03, 2019, 06:54:28 AM »

https://www.youtube.com/watch?v=H4xX7VecgzA
A really aggressive product comparison and multi materials gluing test and I was surprised how badly one of my favorites did.
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roycv

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Re: Glue test. Gorilla/Flex/Loctite/JB Weld Youtube.
« Reply #27 on: January 03, 2019, 08:33:12 AM »

Hi TT, I think this video has been put on this forum a year or so back, but I watched it again.  It is a thorough test but as he points out JB Weld is a two part adhesive,
I would like to make a point about PVA or white glue.  Nearly all modellers have spring type clamps holding the joint until it dries.  These form brittle joints.  If you clamp with a screw clamp the joint will not fail before the wood does.

 I inadvertantly found out after having mistakenly glued up part of a boat hull wrongly.  I had to undo the glue joint and reverse a part.  there were some spring and some screw clamps used.
The spring clamped joint opened up with a knife blade inserted, the screw clamped would not open at all, the wood split apart.
I still use the spring clamps but not much, I now use screw clamps where ever I can.
Regards

Roy
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KitS

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Re: Glue test. Gorilla/Flex/Loctite/JB Weld Youtube.
« Reply #28 on: January 03, 2019, 09:15:11 AM »


I would like to make a point about PVA or white glue.  Nearly all modellers have spring type clamps holding the joint until it dries.  These form brittle joints.  If you clamp with a screw clamp the joint will not fail before the wood does.


Why?

How does the wood/plastic/whatever know what's producing the clamping force?
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Kit

roycv

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Re: Glue test. Gorilla/Flex/Loctite/JB Weld Youtube.
« Reply #29 on: January 03, 2019, 10:12:22 AM »

Hi KitS, it is a matter of how much pressure is exerted.  The screw clamps enabled a lot more pressure to be applied.  This squeezes the glue into the wood surface.  However it is only for porous materials like wood that this applicable.
Solvent 'glues' used sparingly for plastic to plastic joints weld the two parts together.  They then become as one.

If you are working with metal then a soft solder joint (lead and tin) is eleven times stronger than an epoxy joint, quote from Model Makers engineering manual.

There are several types of epoxy there are others better informed on those than myself.  I do find the cheap Poundland epoxy works for most things.  I do not know whether price is a guide here.
The interesting glues are the multi surface ones.  I use Stablit Express for plastic to wood.  It is two part and rather expensive but the best I have found.

Some items like electric motors using 20 watts or less can be held in place using clear bathroom sealant it works well absorbs a little vibration and a strong pull releases the motor if necessary, likewise for sealing a prop tube in place, it is quite strong enough and if you wear out the bearings in the shaft, easily repairable.
I sometimes restore old model boats and frequently replace the prop shaft and tube.  I find a pair of gripping pliers around the prop tube and a sudden 30 degree twist breaks most old glue joints.
regards
Roy
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tigertiger

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Re: Glue test. Gorilla/Flex/Loctite/JB Weld Youtube.
« Reply #30 on: January 03, 2019, 10:48:31 AM »

Clamping pressure is important to get glue down into the grains. Although too much pressure can also push the glue out and leave the joint dry.
One thing I would say about the wood test in the video, the tester is gluing end grain to end grain, which is never recommended. Neither is end grain to long grain if it can be avoided. Long grain to long grain is always best, and even PVA joints will be stronger than the wood if done properly. I use outdoor grade PVA for almost everything now. I would only splash out for some of the specialist glues if I need longer assembly times. Things like Titebond are import only items here and cost way too much.
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