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Yes @Scilly.Suffolk what Matt says. Tinning layer. I'll snap some photos tomorrow.
The idea is that you stabilise the main triangle by doing this while is in the jig, using a quadrant approach. After this I then build fillets in quadrants. Basically I don't have a alignment table anymore and this technique should help avoid having to use that. It is a first time for me doing it this way.
I think it's a typo, and actually tinning?
The equivalent of a fusion weld.