Just a follow up on the use of MarineTex. The reason it is so effective is that it adheres so well, provides strength, and most importantly, it is totally impervious to moisture. (In effect, it works like somewhat like POR 15.) It's best if you use it on both side of the joined area to totally seal the weld. You can then finish it normally or add some regular filler which is easier to sand than MarineTex.
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