..such as crevices, regular plumbing flux and whilst I have experienced luck with most solders, four% silver bearing solder is much better In the long term...kinda highly-priced tho... I'd Harris solder on hand at the time so no significant deal for me but high-priced if you do not need to https://types-of-car-trailers39516.free-blogz.com/74511100/detailed-notes-on-types-of-solder-to-use-on-aluminum-radiator