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Hairline cracks when heat/steam bending?

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Marin:
So I've been working with a juniper stave and usually I don't have trouble with heat straightening and bending. I am able to shape the wood but for whatever reason I sometimes see these small hairline longitudinal cracks appear in one area of the same limb, usually on the belly but someimes also on the back. Luckily they are very shallow and can be scraped away. They however keep reappearing, and seem to have reappeared especially now that I've been using steam to shape the bow. I would not be concerned for the ones on the belly but the one on the back keeeps reappearing and I have to scrape it away, and if I keep doing this, it will create an uneven back. I am going to back this bow with 2 - 3 layers of sinew fyi, so I could put extra sinew there, but I am not sure......
Anyone else seen this issue with small shallow hairline cracks appearing after heat/steam? The wood was cut back in october but has been shaped for more than a month so I definitely don't think it is still green and that these somehow are checks.
Is this something to be worried about?

bradsmith2010:
it think your ok with the sinew

superdav95:
Ya it’s happened to me as well.  My hairline or Small cracks happened when I rushed the drying of the corrections and recurves or if wood has had rapid air drying(faster then normal) dry time.   I would just fill with very thin hide glue when you size the surface of the bow in prep for sinew. Size (applying initial layers of thin glue) the bow well before with very thin glue and use a hacksaw blade to put shallow fine groove your bows back.  Good luck. 

Marin:
Do you guys know what causes the cracks tho? I’ve been trying to figure it out and have my own theories but nothing that makes full sense

George Tsoukalas:
It is hard to find a reason but these 2 come to mind. Could be the stave was not dry enough. Could be the wood was forced before was ready.

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