{"id":609,"date":"2026-01-28T19:05:21","date_gmt":"2026-01-28T19:05:21","guid":{"rendered":"https:\/\/bredowap.com\/?p=609"},"modified":"2026-01-28T20:05:39","modified_gmt":"2026-01-28T20:05:39","slug":"roofinox-tin-matt-soldering-stop-black-stains-and-pinhole-leaks","status":"publish","type":"post","link":"https:\/\/bredowap.com\/?p=609","title":{"rendered":"Roofinox Tin Matt soldering: stop black stains and pinhole leaks"},"content":{"rendered":"<h2>Roofinox Tin Matt can solder great. But it has a <strong data-start=\"117\" data-end=\"132\">tin surface<\/strong>, so your steps matter. Here are the big rules.<\/h2>\n<h2 data-start=\"186\" data-end=\"222\">1) Flux: wipe it off every time<\/h2>\n<p data-start=\"223\" data-end=\"340\">Flux helps solder flow.<br data-start=\"246\" data-end=\"249\" \/>But if you <strong data-start=\"260\" data-end=\"290\">leave flux on the Tin Matt<\/strong>, it can keep reacting and <strong data-start=\"317\" data-end=\"339\">turn the tin black<\/strong>.<\/p>\n<p data-start=\"342\" data-end=\"356\"><strong data-start=\"342\" data-end=\"354\">Do this:<\/strong><\/p>\n<ul data-start=\"357\" data-end=\"457\">\n<li data-start=\"357\" data-end=\"387\">\n<p data-start=\"359\" data-end=\"387\">Use flux only where needed<\/p>\n<\/li>\n<li data-start=\"388\" data-end=\"457\">\n<p data-start=\"390\" data-end=\"457\">When the seam is done: <strong data-start=\"413\" data-end=\"457\">wipe + rinse with fresh water right away<\/strong><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-612\" src=\"https:\/\/bredowap.com\/wp-content\/uploads\/2026\/01\/ROOFINOX_FLM_300x400.png\" alt=\"\" width=\"967\" height=\"725\" srcset=\"https:\/\/bredowap.com\/wp-content\/uploads\/2026\/01\/ROOFINOX_FLM_300x400.png 967w, https:\/\/bredowap.com\/wp-content\/uploads\/2026\/01\/ROOFINOX_FLM_300x400-300x225.png 300w, https:\/\/bredowap.com\/wp-content\/uploads\/2026\/01\/ROOFINOX_FLM_300x400-768x576.png 768w\" sizes=\"auto, (max-width: 967px) 100vw, 967px\" \/><\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"459\" data-end=\"462\" \/>\n<h2 data-start=\"464\" data-end=\"491\">2) Heat: solder colder<\/h2>\n<p data-start=\"492\" data-end=\"534\">You are <strong data-start=\"500\" data-end=\"518\">melting solder<\/strong>, not stainless.<\/p>\n<p data-start=\"536\" data-end=\"560\">If you solder too hot:<\/p>\n<ul data-start=\"561\" data-end=\"714\">\n<li data-start=\"561\" data-end=\"644\">\n<p data-start=\"563\" data-end=\"644\">The tin surface can discolor (sometimes on the back side, sometimes both sides)<\/p>\n<\/li>\n<li data-start=\"645\" data-end=\"714\">\n<p data-start=\"647\" data-end=\"714\">The stainless stays hot longer, so the solder stays liquid too long<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"716\" data-end=\"790\"><strong data-start=\"716\" data-end=\"727\">Result:<\/strong> the solder can <strong data-start=\"743\" data-end=\"766\">pull out of the lap<\/strong> and leave <strong data-start=\"777\" data-end=\"789\">pinholes<\/strong>.<\/p>\n<hr data-start=\"792\" data-end=\"795\" \/>\n<h2 data-start=\"797\" data-end=\"842\">3) Pinholes can leak by capillary action<\/h2>\n<p data-start=\"843\" data-end=\"944\">Tiny holes or tiny gaps can move water through the joint. The leak can show up <strong data-start=\"922\" data-end=\"943\">far from the seam<\/strong>.<\/p>\n<p data-start=\"843\" data-end=\"944\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-615\" src=\"https:\/\/bredowap.com\/wp-content\/uploads\/2026\/01\/ChatGPT-Image-Jan-28-2026-12_00_58-PM.png\" alt=\"\" width=\"676\" height=\"265\" srcset=\"https:\/\/bredowap.com\/wp-content\/uploads\/2026\/01\/ChatGPT-Image-Jan-28-2026-12_00_58-PM.png 1024w, https:\/\/bredowap.com\/wp-content\/uploads\/2026\/01\/ChatGPT-Image-Jan-28-2026-12_00_58-PM-300x118.png 300w, https:\/\/bredowap.com\/wp-content\/uploads\/2026\/01\/ChatGPT-Image-Jan-28-2026-12_00_58-PM-768x302.png 768w\" sizes=\"auto, (max-width: 676px) 100vw, 676px\" \/><\/p>\n<p data-start=\"946\" data-end=\"967\"><strong data-start=\"946\" data-end=\"965\">Why it happens:<\/strong><\/p>\n<ul data-start=\"968\" data-end=\"1122\">\n<li data-start=\"968\" data-end=\"1016\">\n<p data-start=\"970\" data-end=\"1016\">Too much heat = solder stays liquid too long<\/p>\n<\/li>\n<li data-start=\"1017\" data-end=\"1062\">\n<p data-start=\"1019\" data-end=\"1062\">Solder runs thin or pulls out of the seam<\/p>\n<\/li>\n<li data-start=\"1063\" data-end=\"1122\">\n<p data-start=\"1065\" data-end=\"1122\">Burned\/dirty flux can also cause weak \u201cwetting\u201d and voids<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"1124\" data-end=\"1127\" \/>\n<h2 data-start=\"1129\" data-end=\"1170\">4) Rivets + solder = the right combo<\/h2>\n<p data-start=\"1171\" data-end=\"1230\"><strong data-start=\"1171\" data-end=\"1196\">Rivets give strength.<\/strong><br data-start=\"1196\" data-end=\"1199\" \/><strong data-start=\"1199\" data-end=\"1230\">Solder makes it watertight.<\/strong><\/p>\n<p data-start=\"1232\" data-end=\"1364\">Without rivets, thermal movement can crack a solder-only joint.<br data-start=\"1295\" data-end=\"1298\" \/>With rivets, the joint stays stable and the solder can do its job.<\/p>\n<p data-start=\"1232\" data-end=\"1364\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-614\" src=\"https:\/\/bredowap.com\/wp-content\/uploads\/2026\/01\/ChatGPT-Image-Jan-28-2026-11_51_09-AM-crop.png\" alt=\"\" width=\"621\" height=\"475\" srcset=\"https:\/\/bredowap.com\/wp-content\/uploads\/2026\/01\/ChatGPT-Image-Jan-28-2026-11_51_09-AM-crop.png 1001w, https:\/\/bredowap.com\/wp-content\/uploads\/2026\/01\/ChatGPT-Image-Jan-28-2026-11_51_09-AM-crop-300x230.png 300w, https:\/\/bredowap.com\/wp-content\/uploads\/2026\/01\/ChatGPT-Image-Jan-28-2026-11_51_09-AM-crop-768x588.png 768w\" sizes=\"auto, (max-width: 621px) 100vw, 621px\" \/><\/p>\n<hr data-start=\"1366\" data-end=\"1369\" \/>\n<h2 data-start=\"1371\" data-end=\"1421\">5) Patina helps later (but don\u2019t count on it)<\/h2>\n<p data-start=\"1422\" data-end=\"1563\">Tin forms a patina over time and the roof trends toward a more even gray.<br data-start=\"1495\" data-end=\"1498\" \/>It can soften some discoloration, but it may not hide everything.<\/p>\n<hr data-start=\"1565\" data-end=\"1568\" \/>\n<h2 data-start=\"1570\" data-end=\"1599\">Roofer\u2019s quick checklist<\/h2>\n<ul data-start=\"1600\" data-end=\"1765\">\n<li data-start=\"1600\" data-end=\"1625\">\n<p data-start=\"1602\" data-end=\"1625\">Don\u2019t flood with flux<\/p>\n<\/li>\n<li data-start=\"1626\" data-end=\"1658\">\n<p data-start=\"1628\" data-end=\"1658\">Heat only until solder flows<\/p>\n<\/li>\n<li data-start=\"1659\" data-end=\"1691\">\n<p data-start=\"1661\" data-end=\"1691\">Don\u2019t overheat the stainless<\/p>\n<\/li>\n<li data-start=\"1692\" data-end=\"1717\">\n<p data-start=\"1694\" data-end=\"1717\">Rivet soldering joints always<\/p>\n<\/li>\n<li data-start=\"1718\" data-end=\"1765\">\n<p data-start=\"1720\" data-end=\"1765\">Clean the seam area right away (wipe + rinse)<\/p>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3><a href=\"https:\/\/bredowap.com\/?p=412\">Here is a more in-depth post about soldering\u00a0<\/a><\/h3>\n","protected":false},"excerpt":{"rendered":"<p>Tin Matt can solder great, but it\u2019s unforgiving if you rush the basics.<br \/>\nRemember:<br \/>\nRivet for strength. Solder for seal. Clean for looks.<\/p>\n","protected":false},"author":1,"featured_media":614,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[129,119],"tags":[204,207,205,208,200,199,211,209,206,203,210,201,202],"class_list":["post-609","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-explainer","category-roofinox","tag-black-staining-tin-surface","tag-capillary-action-leak","tag-heat-discoloration-tin-matt","tag-riveted-soldered-seams","tag-roofinox-soldering","tag-roofinox-tin-matt","tag-roofinox-tin-matt-patina","tag-sheet-metal-roof-soldering","tag-solder-seam-pinholes","tag-soldering-flux-stains","tag-stainless-roofing-solder-details","tag-terne-coated-stainless-steel","tag-tin-coated-stainless-roofing"],"_links":{"self":[{"href":"https:\/\/bredowap.com\/index.php?rest_route=\/wp\/v2\/posts\/609","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bredowap.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bredowap.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bredowap.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bredowap.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=609"}],"version-history":[{"count":5,"href":"https:\/\/bredowap.com\/index.php?rest_route=\/wp\/v2\/posts\/609\/revisions"}],"predecessor-version":[{"id":620,"href":"https:\/\/bredowap.com\/index.php?rest_route=\/wp\/v2\/posts\/609\/revisions\/620"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bredowap.com\/index.php?rest_route=\/wp\/v2\/media\/614"}],"wp:attachment":[{"href":"https:\/\/bredowap.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=609"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bredowap.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=609"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bredowap.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=609"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}