{"id":10032,"date":"2019-11-01T08:05:29","date_gmt":"2019-11-01T14:05:29","guid":{"rendered":"https:\/\/www.ulprospector.com\/knowledge\/?p=10032"},"modified":"2023-07-18T09:02:19","modified_gmt":"2023-07-18T15:02:19","slug":"pc-roof-paint-head-scratchers","status":"publish","type":"post","link":"https:\/\/ulprospector.ul.com\/10032\/pc-roof-paint-head-scratchers\/","title":{"rendered":"Roof Paint Head Scratchers\u00a0"},"content":{"rendered":"

Introduction<\/h3>\n

\"RoofOne of the growing product segments in developing paint markets is the painting and re-painting of roofs. Almost every paint company in a rapidly developing paint market will have one or more roof coatings on their range whether it be a straight forward roof paint for metal or tile roofs a water proofing coating or a heat reflecting coating\u00a0all these coating types have issues arising from problems in the field. The aim of this head scratcher is to show\u00a0how an investigation of a complex roof paint problem can\/should proceed:<\/p>\n

Scene Setting<\/h3>\n

Up to about twenty years ago, most Southern African paint companies made premium quality roof coatings in oxide colors and did not have any major problems except when the applicators forgot to prepare the substrates properly or one them decided to make a very bright color that faded quickly.<\/p>\n

If the substrate was oily or friable\/powdery and applicator did not rectify these issues the paint would flake and peel. And bright colors under the high degree of sunshine present in Southern Africa will chalk and fade a lot quicker than a roof paint is expected to.<\/p>\n

\"Example<\/p>\n

Then in the mid- to late-1990\u2019s, we started to get oxide pigmented roof paints going lighter in six to nine months in Southern Africa, but not in all regions, and it wasn\u2019t limited to one company\u2019s paint but many companies\u2019 paint, but only in certain regions.<\/p>\n

\"ExampleOn investigation, the lightening in color was found to be due to acid rain caused by industrial pollution\/coal fired power stations and crop burning. For further details of the problem\/solution, see Minimising the Effects of Acidic Airborne Pollution<\/a><\/em>.<\/p>\n

Once the acid rain issues were resolved, everything went quiet for about 10-12 years, but due to various economic\/political factors, the roof paint market in Southern Africa changed from mostly oxide colors to various shades of medium to dark grey\/charcoal and even black. We began to see early failures even on those formulations that were previously found to be acid rain inert. Also, it was not limited to one paint company or region. The only connecting factors were that they were roof paints and various greys. It wasn\u2019t limited to color change\u2014chalking also occurred. The situation got so bad for one paint company that they seriously considered\u00a0 totally dropping grey\/charcoal roof paints from their range as although dark greys\/charcoal accounted for 15% of their roof paint sales, they were 80% of their reported failures.\"Example<\/strong>After an in-depth Investigation, we found that the problem was multi-faceted. Certainly UV and IR play a big role in the problem, but you can only really reproduce the field problems in an accelerated manner by combining UV and IR in a cyclic test series. It also seems to be binder, pigment, film build and texture related. For more details, please see Mirmac APCC UV-IR Presentation Final<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Introduction One of the growing product segments in developing paint markets is the painting and re-painting of roofs. Almost every paint company in a rapidly developing paint market will have one or more roof coatings on their range whether it … Continued<\/a><\/p>\n","protected":false},"author":62,"featured_media":10037,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"episode_type":"","audio_file":"","podmotor_file_id":"","podmotor_episode_id":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","filesize_raw":"","date_recorded":"","explicit":"","block":"","itunes_episode_number":"","itunes_title":"","itunes_season_number":"","itunes_episode_type":"","footnotes":""},"categories":[16],"tags":[],"ppma_author":[1274],"class_list":{"0":"post-10032","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-paint-coatings","8":"entry"},"yoast_head":"\nRoof Paint Head Scratchers\u00a0 - Prospector Knowledge Center<\/title>\n<meta name=\"description\" content=\"In this head scratcher by Philip Green, learn how an investigation of a complex roof paint problem led to some informative solutions.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ulprospector.ul.com\/10032\/pc-roof-paint-head-scratchers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Roof Paint Head Scratchers\u00a0 - Prospector Knowledge Center\" \/>\n<meta property=\"og:description\" content=\"In this head scratcher by Philip Green, learn how an investigation of a complex roof paint problem led to some informative solutions. Read more:\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ulprospector.ul.com\/10032\/pc-roof-paint-head-scratchers\/\" \/>\n<meta property=\"og:site_name\" content=\"Prospector Knowledge Center\" \/>\n<meta property=\"article:published_time\" content=\"2019-11-01T14:05:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-07-18T15:02:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2019\/10\/Roof-paint-iStock-672192910-1200x630.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Philip Green\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:description\" content=\"In this head scratcher by Philip Green, learn how an investigation of a complex roof paint problem led to some informative solutions. 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After working at a Research Nuclear Reactor in the UK, then as an Explosives Chemist in South Africa, he finally joined the South African paint industry in 1982. He first worked for Dulux South Africa from 1982-1996, working his way up from bench chemist to Senior Development Manager for all Decorative Products in Southern Africa. He then went to Mauritius where he was Technical\/Production Manager for a paint company SOFAP LTEE. He returned to South Africa in 1998 and has been an independent Paint Technology Consultant ever since. He has worked in 48 countries around the world, 21 in Africa, and has had over 50 papers published in journals and at paint conferences.","sameAs":["http:\/\/scrchemicals.co.za"],"url":"https:\/\/ulprospector.ul.com\/author\/philip\/"}]}},"authors":[{"term_id":1274,"user_id":62,"is_guest":0,"slug":"philip","display_name":"Philip Green","avatar_url":"https:\/\/ulprospector.ul.com\/media\/2017\/12\/Philip-Green_avatar_1512676090-96x96.jpg","0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/posts\/10032","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/users\/62"}],"replies":[{"embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/comments?post=10032"}],"version-history":[{"count":0,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/posts\/10032\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/media\/10037"}],"wp:attachment":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/media?parent=10032"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/categories?post=10032"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/tags?post=10032"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/ppma_author?post=10032"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}