>
> solderpaste has already flux, is it necessary to add more? i wanted to
> try for my first time flux (water based no-clean seems the best one)
> but thought it isn't necessary if the solderpaste already has..
>
You are right the solderpaste already has plenty of flux.
It is enough for the initial soldering, and you can also replace
components if need be without adding any solder or flux, at least that
is what i find. It is hard to distinguish between a reflow soldered
part and one replaced using hot air. If a lot of part swapping is
needed additional solder paste or wire solder needs to be applied from
time to time, or you get dry joints.
>
> you have a great website! i've been reading article 5, the others talk
> about hand soldering, something i'll try to avoid if possible :)
You will have to get proficient at it too. If you develop circuits of
any complexity changes need to be made.
ST