OK, I know that cab-o-sil is stronger than wood flour. For my WD12, I am just about ready to mate the hull to the deck. The manual calls for cab-o-sil for the tack welding and as luck would have it, I just ran out. I was hoping to get to it over this weekend and have lots of wood flour. Normally I would not worry, but my deck is about 2" wider than the hull at the foot pegs right now so there will be lots of stress. I thinking that once the fillets and glass are in, the choice will be irrelevant.
so my question is do you think that tack weld with wood flour considering the stress will be strong enough?