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Weldon 3 set very fast and will wick into a seam. The edges to be fastened need to be very flat and smoothe, no tool marks. Flame polish if possible. Clamp and tape the pieces together and use a fine tip syringe, flow the # 3 along the joint. It will suck in, but has no ability to fill, so if the pieces are not smoothe and flat, it will leak. I like to go back over the inside of the seams with weldon 16.
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