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12th December 2008, 11:08 AM #16
Rapsod,
I got the gelatin tip from archery books so it is as good as the better hide glues on the market
regards
John
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12th December 2008, 12:09 PM #17
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12th December 2008, 12:55 PM #18
Neither hot nor cold (liquid) HG should be relied on to fill gaps.
Interestingly, even the latest PVA glues are only 5-10% stronger than HG and polyurethane glues doesn't quite match the strength of HG.
Stanford University ran back to back tests of hot and cold HG and came to the conclusion that, at up to 50% RH, cold HG is actually stronger than hot HG. Thereafter, there's virtually no difference in strength between the two as long as the humidity doesn't exceed about 75% (for extended periods and only where there's tension or strain on the glued parts).
If you want to extend the open time of hot HG, you can add about 5-10% urea (available at Bunnies or any garden centre) by weight to freshly made glue. That's the basis of most brands of cold HG.
You can also make HG waterproof for outdoor use by adding about 1% aluminium sulphate. Don't use this for antique furniture though!.
I know you believe you understand what you think I wrote, but I'm not sure you realize that what you just read is not what I meant.
Regards, Woodwould.
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12th December 2008, 12:55 PM #19
I sure hope not, Greg!
Gelatin for cooking is cleaned up precisely to get rid of the offensive odours. Nevertheless, it is still essentially the same stuff as glue, i.e. collagen. So if you have a taste for stronger flavours, you could make a nice jelly tart from the Pearls.....
IW
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12th December 2008, 01:21 PM #20
My workshop dog, a Fox Terrible (very recently deceased and sorely missed), had a penchant for horse sauce. When I glued up sets of chairs, I would set them on the floor for him to do the initial clean-up of surplus glue - a dog's tongue can get into all sorts of nooks and crannies!
As was his mother before him, he was very grateful of any two day old left over glue to suppliment his dinner. His successor is now in training for the same cleaning-up tasks..
I know you believe you understand what you think I wrote, but I'm not sure you realize that what you just read is not what I meant.
Regards, Woodwould.
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12th December 2008, 01:24 PM #21
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12th December 2008, 01:38 PM #22
Mmmmmmm! Now that's a taste that I can do without. I imagine that the dogs would like it though, as WW mentioned. What is it with dogs and that stuff? Same with horse hooves. Every time I watched a horse being shod there would be a barn dog ready to dart in for the clippings.
Greg
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12th December 2008, 01:44 PM #23
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12th December 2008, 01:52 PM #24
I have just ordered a large leg wax pot from the local hairdresser (well, I sent SWMBO down to do it). $69 on special. Thank you for the tip
"I don't practice what I preach because I'm not the kind of person I'm preaching to."
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12th December 2008, 01:57 PM #25.
I know you believe you understand what you think I wrote, but I'm not sure you realize that what you just read is not what I meant.
Regards, Woodwould.
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12th December 2008, 03:32 PM #26
Silent - just a tip, don't follow the instructions to turn it up full whack to "get it up to temperature" like I did. I can't for the life of me fathom why I read the damned instructions - something I almost NEVER do - but maybe it was the unfamiliarity of this particular bit of equipment! So after soaking my brew, I set it at max & went about my business in the shed - when I looked at the pot about 5 minutes later to see what was happening, it was starting to boil at the edges. Not good for HG! So now I leave it at the setting I worked out that just brings it to the right temperature (judged from what I'm used to with the old double-boiler gluepot, one of these days I'll pinch the cooking thermometer when SWMBO isn't looking & test it). I usually make very small batches, & it doesn't take very long to warm up to the useable stage.
So you sent the other half to the hairdresser, eh? Hah, you wus, you - I went to a hairdressers' wholesale place to get mine all by myself. The young things who served me were very helpful, but looked a bit askance when I told them what I was going to do with it.
Cheers,IW
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12th December 2008, 03:34 PM #27
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12th December 2008, 03:39 PM #28So you sent the other half to the hairdresser, eh?
Temperature-wise I figure I'll just start off at the cool end and work my way up. I suppose I'd better put in an order for some pearls.... The wife will start to worry about me (or get suspicious) about these purchases. Leg waxer, pearls, what next?"I don't practice what I preach because I'm not the kind of person I'm preaching to."
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12th December 2008, 03:50 PM #29
Yeah - if you don't have a thermometer, 60 degrees is just a bit hotter than you can stand to put your pinky in (about an average hot water system output temp?). After a bit you just rely on the consistency of the brew to know when it's up to temp.- 'tisn't that critical, as long as you don't go much over 60, which denatures the proteins a little too severely.
WRT tht pearls: My first attempt to buy a waxpot was in a place in a shopping mall advertising beauty supplies. A very nice young man minced out & started extolling the virtues of their double pot, & started educating me on the properties of all the different waxes & which hairs they were good for - it seems you have waxes for light days & heavy days...... When I told him I wanted just a single pot to heat glue in, he went quite strange & looked at me in such a pitying way, I mumbled something & slunk out of the shop. I didn't like the look of the flimsy thing, anyway - it didn't look like it would survive even one trip to the workshop floor (not that I'm intending to chuck pots og glue around, but in the heat of a hectic glue-ip, things happen!).
Avagoodone,IW
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12th December 2008, 03:58 PM #30
I've got a photographic thermometer but it only goes up to 40. So when the top shoots off that, we should be right
It's funny that they don't bat an eyelid when they think you're buying it to wax your legs, but as soon as you say it's for glue, they go all strange. Not quite like that here in the country. The missus told them what it was for straight up and they acted as though they're asked about it every day of the week."I don't practice what I preach because I'm not the kind of person I'm preaching to."
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