Sitka is strongest when its in tension with itself and surfaces that are parallel. As you move around the edges of the tube, it turns into shear stress. Not sitkas strong suit. The min thickness should be considered absolute - if you have less than this, you want it in as very few places as possible.
Just my .02 but why mess with what works? Put in your spacers, squeeze in blobs in places, let that tack up good then go back and do full tube width all around the frame. It works. Just like caulking your bathroom tub. You wouldnt put caulk on your tub or walls and then try to set it in place, would you?
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Last edited by maniago : 07-22-2018 at 04:51 PM.