Weldon 40 is nice to work with because it's thick and not runny but it's not easy to make clean welds with it.
Something runnier like #4 is probably your better bet for super clean joins, but it's much harder to work with (at least I think so). I think you get your pieces placed together first and applied with pressure, then you take a needle bottle thing and follow it along and the weldon wicks into the join area.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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