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Sizing horn

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mikekeswick:
Each to his own but I don't see the point in taking any risks with poor bonding. How much work have you put in so far? How much to go? Then the waiting :) All that with a possible weak glueline? Not for me!
Any grey areas are voids. The whole surface should be glossy black. The hotter the glue (upto max 60 degs) the more 'flow' it has and therefore better wetting of the surface. Warm horn and hot glue are the keys in my opinion. I keep the horns/core in a small hotbox kept at about 25 degs during drying and warm each part further before applying each sizing coat.
As long as you are using thin glue during sizing and you leave enough time inbetween coats you can get the parts to 30 degs or so in safety.

DC:
Would it help to heat it up a bit and run a sliver up each groove to dislodge the air?

davidjw:
Appreciate the input folks, after mulling it over last night and fighting with myself, I decided I would rather be safe than sorry.  Indeed, as you said Mike, all the work that would go into the bow after a faulty glue up, only to find out much much later, would make me kick myself a little too hard.  I ended up running both horns under warm water and running a knife tip along the grooves to clear them.  DC, I actually hoped to just pop the air bubbles while leaving some of the sizing on, but I ended up just pushing out the re-liquefied glue.  I suppose I will add a coat of sizing to the core every now and again to keep it from oxidizing while I re-size the horns.

If I remember correctly, glue weakens from gelling then being re-heated repeatedly, though this glue is to dilute to gel, but it also weakens from too much heat.  Since the sizing process takes a few days, I was wondering if it is ok to keep the glue hot at 60 degs (but covered to not lose water) the entire time, or should I be letting the glue pot cool between coats? 

Thanks again y'all

bubby:
I don't think good enough is the answer. Do it right or not at all especially with a horn bow the amount of work that goes into one you want to be doing it correctly. Do or so not there is no try😝

mikekeswick:

--- Quote from: DC on December 06, 2016, 12:59:48 pm ---Would it help to heat it up a bit and run a sliver up each groove to dislodge the air?

--- End quote ---

No the sizing coats are dry. The problem is that the grooves are triangles and if you simply brush glue on the surface tension of the glue will cause it to not reach the bottom of the groove.

David the key is to not heat anything too much. I used to keep a digital thermometer handy and regularly check on the glue but now I just use my fingers and feel. If the glue becomes damaged it won't gel or at least take longer than normal to gel. I generally take about one day to do the sizing coats then let them dry for one/two days. I let the glue pot cool between coats.

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