Thanks for the replies. I am looking for what you guys are sharing.
Here is a more detailed explanation of why I ask.
Now that spot and stalk mulie rut season has come and gone, and as I am not harvesting smaller ones, it is prep-time for summer velvet season. I never killed a deer from ambushing, and I plan on that this year.
My interest is in hunting bows that can handle the long periods of being "strung up." You may recall, I go on and on about the wide range of humidity and temps in beloved southern Arizona. I have had reservations about using some non-primitive techniques, like spar poly sprayed over the tru-oil'ed sinewed back for moisture protection. But then, buck only tags and seasons are not exactly primitive either, not one bit. In any case, I know that temps get really high at time, close to 100, over 100, even at 4500 feet elevation.
From what I read, the Chiricahua Apache band built their gull wing bow often without a sinew layer, and I wondered "why is that?" I am looking for the source, but that is what I recall reading from last summer.