Solder paste. I have done multiple lead chips slathering on solder paste. Touch the tip to each chip terminal using the fine point solder tip. The solder almost instantly flows and then a thin coating of flux is left. I use an acid brush with some alcohol to clean up the excess flux. Many home users of electronic circuits have been doing this for some years.
The only critics are usually those who have never tried it.
Some use a toaster oven set at the proper temp to do the same thing.
Below is only one link from a search for, smd solder paste.
The same can be applied to other types of soldering projects. We all have an imagination. Use it.
PC board manufacturers have been using solder paste for many years.
Rich
