..like crevices, regular plumbing flux and although I've experienced luck with most solders, four% silver bearing solder is more powerful Ultimately...kinda highly-priced tho... I had Harris solder on hand at the time so no big deal for me but pricey if you do not have to have the strength for https://ricardoudrlx.pages10.com/a-review-of-types-of-solder-to-use-on-aluminum-radiator-63025008