Lead-free is fine. Lead-free with poor quality flux is abhorrent to use. Get good quality lead-free with good flux from a reputable manufacturer (Kester is go

Lead-free is fine. Lead-free with poor quality flux is abhorrent to use. Get good quality lead-free with good flux from a reputable manufacturer (Kester is good, as you mentioned) and it's fine. In fact, I prefer how thin and quick to wet out SAC305 is over the lower melting point of Sn63Pb37.