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Sizing horn

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Tc:
Those grey streaks are probably burn signs of the grooving tool, and not air bubbles. They appear when you do grooving too fast and the surface of the horn slightly burns (you can smell it as well). In this case the color of the affected areas of the horn change to grey or brawn but it has no effect on bonding. Air bubbles would be a problem. So again, it was good enough....

davidjw:
Mike, thanks for the info, and woo-wee, all the sizing in one day, good on you!  Perhaps letting my horns dry at room temp could contribute to the glue not wetting enough by gelling too soon, as well as longer drying times, up to a couple hours on the later coats.  I've taken your idea of using a heat box and am using the closet with my water heater to size in.  It's about 20-25 deg in there at any given point and the glue seems to dry a bit quicker, and no sign of air bubbles...yet.  I've been using a candy thermometer to check the glue temp.

Tc, thanks for letting me know about the burning, I had not even considered this.  Probably didn't notice a smell because, well, the horns seem to smell a bit in general.  I will definitely keep an eye out for this in the future, and check to see if the grey streaks appear in the same place this time, which could indicate that this is the case.  Glad to hear it doesn't affect the bond though.

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