{"id":1554,"date":"2026-04-27T05:51:01","date_gmt":"2026-04-27T05:51:01","guid":{"rendered":"https:\/\/decasablog.com.br\/pintura\/?p=1554"},"modified":"2026-04-27T05:51:01","modified_gmt":"2026-04-27T05:51:01","slug":"fundo-preparador-para-madeira","status":"publish","type":"post","link":"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/","title":{"rendered":"Fundo preparador para madeira: qual o certo e quando usar"},"content":{"rendered":"<h2><span class=\"ez-toc-section\" id=\"Why_the_right_wood_primer_prevents_stains_peeling_and_wasted_paint\"><\/span>Why the right wood primer prevents stains, peeling, and wasted paint<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For new wood, repainting, MDF, plywood, or a door, always use a wood-specific preparatory primer; a wall primer is incompatible with wood because it does not penetrate the fibers, does not block tannin or resin, and can leave yellowish stains even under white topcoats. According to ABNT NBR 11702:2021 and official manufacturer technical bulletins, the correct product must promote penetration, cohesion, and mechanical adhesion on a porous substrate.<\/p>\n<ul>\n<li>Wood-specific primer penetrates the fibers and consolidates loose areas.<\/li>\n<li>Wall primer on wood is technically incompatible.<\/li>\n<li>New wood usually needs 1 to 2 coats.<\/li>\n<li>MDF requires 1 coat with good penetration.<\/li>\n<li>Doors require mandatory sanding with 120-grit before application.<\/li>\n<li>Drying time is typically 2 to 4 hours.<\/li>\n<\/ul>\n<p>The mechanism is simple: absorption into the substrate improves cohesion, while blocking tannin and resin migration protects the finish. In Brazil, where coastal humidity and regional climate variation are common, this technical choice matters even more.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_mechanism_hidden_behind_a_clean_finish_on_Brazilian_wood\"><\/span>The mechanism hidden behind a clean finish on Brazilian wood<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Wood-specific primer works because it penetrates capillary pores, reduces friability on the surface, and creates a more stable base for the finishing coat. In practice, this means better adhesion on pine, eucalyptus, cedar, ip\u00ea, MDF, and plywood, especially in DIY renovations without professional spray equipment.<\/p>\n<p>When the primer is base aquosa and formulated for wood, it helps control stain bleed and resin migration without forming a weak pelicular film. Wall primer, by contrast, is designed for masonry and does not correct the absorption profile of wood.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_apply_it_without_creating_a_weak_layer\"><\/span>How to apply it without creating a weak layer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li>Inspect the substrate and confirm whether it is new wood, repainted wood, MDF, plywood, or a door. The surface must be dry and free of grease, dust, and loose particles.<\/li>\n<li>Sand doors and flat parts with 120-grit before priming. This improves <strong>ader\u00eancia mec\u00e2nica<\/strong> and removes gloss or old contaminated layers.<\/li>\n<li>Apply the correct wood primer in 1 to 2 coats on new wood, or 1 well-penetrated coat on MDF. Respect the 2 to 4 hour drying window before recoating.<\/li>\n<li>Check for stain bleed after drying, especially on resinous species. If the substrate remains absorbent, apply another coat only if the technical bulletin allows it.<\/li>\n<\/ol>\n<div style=\"border-left:4px solid #f59e0b;background:#fffbeb;padding:12px;border-radius:6px;\">\n<p><strong>Warning:<\/strong> wall primer does not solve tannin bleed, resin migration, or weak coesion in wood. If the board is already peeling or rotten, primer will not repair structural failure.<\/p>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"The_most_practical_choice_for_new_wood_MDF_and_doors\"><\/span>The most practical choice for new wood, MDF, and doors<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<thead>\n<tr>\n<th>Condition<\/th>\n<th>Technical requirement<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>New wood<\/td>\n<td>1 to 2 coats of wood primer<\/td>\n<\/tr>\n<tr>\n<td>MDF<\/td>\n<td>1 coat with good penetration<\/td>\n<\/tr>\n<tr>\n<td>Door<\/td>\n<td>120-grit sanding before application<\/td>\n<\/tr>\n<tr>\n<td>Drying<\/td>\n<td>2 to 4 hours<\/td>\n<\/tr>\n<tr>\n<td>Standard<\/td>\n<td>ABNT NBR 11702:2021<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>In Brazilian renovation reality, this comparison avoids the classic mistake of using a masonry product because it is cheaper or easier to find. The technically correct choice is the wood-specific primer, because it penetrates the fibers and blocks tannin and resin better than a wall primer ever can.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_to_do_before_buying_in_a_hardware_store\"><\/span>What to do before buying in a hardware store<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Antes de escolher o fundo, identifique a esp\u00e9cie de madeira: pinus e eucalipto t\u00eam muito tanino e precisam de fundo com bloqueador espec\u00edfico; madeiras nobres como cedro e ip\u00ea t\u00eam menos tanino mas tamb\u00e9m precisam de fundo espec\u00edfico para madeira.<\/p>\n<p>1. For MDF and compensado, prioritize penetration over film thickness. A good primer must wet the surface evenly and not create a brittle skin.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u00cdndice<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Alternar tabela de conte\u00fado\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#Why_the_right_wood_primer_prevents_stains_peeling_and_wasted_paint\" >Why the right wood primer prevents stains, peeling, and wasted paint<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#The_mechanism_hidden_behind_a_clean_finish_on_Brazilian_wood\" >The mechanism hidden behind a clean finish on Brazilian wood<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#How_to_apply_it_without_creating_a_weak_layer\" >How to apply it without creating a weak layer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#The_most_practical_choice_for_new_wood_MDF_and_doors\" >The most practical choice for new wood, MDF, and doors<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#What_to_do_before_buying_in_a_hardware_store\" >What to do before buying in a hardware store<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#The_common_mistake_that_costs_more_repainting_later\" >The common mistake that costs more repainting later<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#Final_verdict_for_Brazilian_renovators_who_want_a_lasting_finish\" >Final verdict for Brazilian renovators who want a lasting finish<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#Perguntas_Frequentes_sobre_fundo_preparador_para_madeira\" >Perguntas Frequentes sobre fundo preparador para madeira<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#Can_I_use_fundo_preparador_para_madeira_on_MDF\" >Can I use fundo preparador para madeira on MDF?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#How_many_coats_does_new_wood_need\" >How many coats does new wood need?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#Does_sanding_with_120_grit_really_matter_before_a_door_primer\" >Does sanding with 120 grit really matter before a door primer?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#What_is_the_drying_time_before_painting_over_the_primer\" >What is the drying time before painting over the primer?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#Why_does_wall_primer_fail_on_wood\" >Why does wall primer fail on wood?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-madeira\/#Which_product_is_most_trustworthy_according_to_the_standard\" >Which product is most trustworthy according to the standard?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n<p>2. For repintura, remove chalky or friable layers before priming. If the old coating is unstable, no primer can restore cohesion on its own.<\/p>\n<p>3. For doors in humid regions, keep the drying time between 2 and 4 hours and verify the technical bulletin. This prevents premature topcoating and trapped moisture.<\/p>\n<p>Use a wood-specific preparatory primer today, not a masonry primer, and verify the can\u2019s bulletin before opening it.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_common_mistake_that_costs_more_repainting_later\"><\/span>The common mistake that costs more repainting later<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Aplicar fundo de parede em madeira por ser mais barato e acess\u00edvel \u2014 o fundo de alvenaria cria pel\u00edcula superficial que n\u00e3o penetra nas fibras e n\u00e3o bloqueia a migra\u00e7\u00e3o de resina, que depois mancha a tinta de acabamento.<\/strong><\/p>\n<p><strong>O erro:<\/strong> usar masonry primer on wood, especially on new boards, MDF, or doors. This often happens in DIY projects when the buyer assumes all primers work the same.<\/p>\n<p><strong>Por que acontece:<\/strong> the chemistry is different: masonry primers are made for mineral substrates with different porosity and surface energy. Wood needs penetration, consolidation, and tannin control.<\/p>\n<p><strong>Consequ\u00eancia t\u00e9cnica:<\/strong> the finish may yellow, peel, or need rework after the 2 to 4 hour dry window is ignored or the substrate is not sanded with 120 grit.<\/p>\n<p><strong>Como evitar:<\/strong> choose a wood-specific product, follow ABNT NBR 11702:2021 and the official technical bulletin, and respect the recommended coats for each substrate. If the wood is new, apply 1 to 2 coats; if it is MDF, use 1 well-penetrated coat.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Final_verdict_for_Brazilian_renovators_who_want_a_lasting_finish\"><\/span>Final verdict for Brazilian renovators who want a lasting finish<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The correct answer is clear: for madeira nova, repintura, MDF, compensado, and doors, use a primer specific to wood and not a wall primer. According to ABNT NBR 11702:2021 and official manufacturer technical bulletins, this is the safest way to improve penetration, block tannin and resin, and reduce rework.<\/p>\n<p>This guidance is especially useful for homeowners in coastal humidity, mixed climates, and masonry-dominant Brazilian buildings where repair work is often done without professional equipment. Check availability and pricing on Amazon Brasil before buying, and compare the label with the technical bulletin.<\/p>\n<div style=\"background:#f8fafc;border-left:4px solid #2563eb;padding:16px;border-radius:6px;margin-bottom:16px;\">\n<p><strong>Fonte t\u00e9cnica: Boletins t\u00e9cnicos oficiais dos fabricantes e ABNT NBR 11702:2021.<\/strong><\/p>\n<p>Norma de refer\u00eancia: NBR 11702:2021.<\/p>\n<p><span style=\"font-size:0.85em;color:#555;\">Artigo atualizado em 2026 \u2014 an\u00e1lise baseada em boletins t\u00e9cnicos oficiais e NBR 11702:2021.<\/span><\/p>\n<\/div>\n<div style=\"background:#fff;border:1px solid #e2e8f0;border-radius:8px;padding:16px;width:100%;box-shadow:0 1px 4px rgba(0,0,0,0.08);\">\n<p><img decoding=\"async\" src=\"https:\/\/m.media-amazon.com\/images\/I\/610cl+KwLyL._AC_SX679_.jpg\" width=\"100%\" style=\"border-radius:8px;margin-bottom:12px;\" alt=\"fundo preparador para madeira\" title=\"fundo preparador para madeira\"><\/p>\n<p><a href=\"https:\/\/amzn.to\/4d3tBUZ\" target=\"_blank\" rel=\"noopener sponsored\" style=\"display:block;width:100%;box-sizing:border-box;border-radius:999px;padding:13px;font-weight:bold;text-align:center;text-decoration:none;color:#111;background:linear-gradient(to right,#FFE083,#F5C400);\">Ver na Amazon<\/a><\/p>\n<\/div>\n<p><strong>Aviso importante:<\/strong> this article summarizes technical data and does not replace official technical bulletins or professional evaluation for specific conditions.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Perguntas_Frequentes_sobre_fundo_preparador_para_madeira\"><\/span>Perguntas Frequentes sobre fundo preparador para madeira<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div style=\"margin-bottom:1.5rem;\">\n<h3><span class=\"ez-toc-section\" id=\"Can_I_use_fundo_preparador_para_madeira_on_MDF\"><\/span>Can I use fundo preparador para madeira on MDF?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Sim, but only if it is a wood-specific product designed for penetration and adhesion on low-absorption surfaces. MDF usually needs 1 well-penetrated coat and proper dust removal before application.<\/p>\n<p>Wall primer is not the right choice because it does not stabilize the fiber structure or control absorption correctly. Always verify the technical bulletin and ABNT NBR 11702:2021.<\/p>\n<\/div>\n<div style=\"margin-bottom:1.5rem;\">\n<h3><span class=\"ez-toc-section\" id=\"How_many_coats_does_new_wood_need\"><\/span>How many coats does new wood need?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Madeira nova generally needs 1 to 2 coats of wood primer, depending on porosity and the manufacturer\u2019s bulletin. Highly absorbent boards may require the second coat to equalize the substrate.<\/p>\n<p>Do not exceed the recommended build unnecessarily, because excessive film can reduce penetration and harm adhesion.<\/p>\n<\/div>\n<div style=\"margin-bottom:1.5rem;\">\n<h3><span class=\"ez-toc-section\" id=\"Does_sanding_with_120_grit_really_matter_before_a_door_primer\"><\/span>Does sanding with 120 grit really matter before a door primer?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes, 120-grit sanding is mandatory before priming a door because it opens the surface and improves mechanical adhesion. It also removes gloss, old contaminants, and fragile layers.<\/p>\n<p>This step is especially important in humid Brazilian regions where poor prep quickly shows as peeling or stain bleed.<\/p>\n<\/div>\n<div style=\"margin-bottom:1.5rem;\">\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_drying_time_before_painting_over_the_primer\"><\/span>What is the drying time before painting over the primer?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>2 to 4 hours is the technical drying window commonly indicated for wood-specific primer. The exact time depends on temperature, humidity, and the product\u2019s official bulletin.<\/p>\n<p>In coastal cities, wait for full drying before topcoating to avoid trapping moisture and reducing durability.<\/p>\n<\/div>\n<div style=\"margin-bottom:1.5rem;\">\n<h3><span class=\"ez-toc-section\" id=\"Why_does_wall_primer_fail_on_wood\"><\/span>Why does wall primer fail on wood?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>N\u00e3o penetra nas fibras and does not block tannin or resin migration, so it cannot prepare wood correctly. The result is poor cohesion and a higher risk of yellow stains under light colors.<\/p>\n<p>Use a product formulated for wood if the substrate is madeira nova, repintura, MDF, compensado, or a door.<\/p>\n<\/div>\n<div style=\"margin-bottom:1.5rem;\">\n<h3><span class=\"ez-toc-section\" id=\"Which_product_is_most_trustworthy_according_to_the_standard\"><\/span>Which product is most trustworthy according to the standard?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The product that follows ABNT NBR 11702:2021 and the official technical bulletin for wood use is the safest choice. That is the basis for selecting the correct primer in Brazilian renovation work.<\/p>\n<p>When in doubt, compare the label claims with the bulletin before buying.<\/p>\n<\/div>\n<p><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Can I use fundo preparador para madeira on MDF?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Sim, but only if it is a wood-specific product designed for penetration and adhesion on low-absorption surfaces. MDF usually needs 1 well-penetrated coat and proper dust removal before application. Wall primer is not the right choice because it does not stabilize the fiber structure or control absorption correctly. 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When in doubt, compare the label claims with the bulletin before buying.\"}}]}<\/script><\/p>\n<p><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"Article\",\"headline\":\"Fundo preparador para madeira: qual o certo e quando usar\",\"author\":{\"@type\":\"Person\",\"name\":\"Equipe Editorial DecasaBlog\",\"jobTitle\":\"Especialista em Reformas e Pintura Residencial\"},\"publisher\":{\"@type\":\"Organization\",\"name\":\"DecasaBlog\"},\"datePublished\":\"2026-01-01\",\"dateModified\":\"2026-04-01\",\"description\":\"Descubra qual fundo preparador usar para madeira, por tipo de superf\u00edcie, e evite manchas de tanino e descascamento\",\"about\":{\"@type\":\"Thing\",\"name\":\"fundo preparador de parede\",\"sameAs\":\"NBR 11702:2021 e Boletins t\u00e9cnicos oficiais dos fabricantes e ABNT NBR 11702:2021\"}}}<\/script><\/p>\n<p><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"Product\",\"name\":\"fundo preparador de parede\",\"description\":\"Guia de sele\u00e7\u00e3o do fundo preparador certo para madeira por tipo: madeira nova, repintura, MDF, compensado e porta \u2014 diferen\u00e7a entre fundo espec\u00edfico para madeira e fundo de alvenaria, e crit\u00e9rios t\u00e9cnicos para cada situa\u00e7\u00e3o.\",\"offers\":{\"@type\":\"Offer\",\"url\":\"https:\/\/amzn.to\/4d3tBUZ\",\"priceCurrency\":\"BRL\",\"availability\":\"https:\/\/schema.org\/InStock\"}}}<\/script><\/p>\n<p>&nbsp;<\/p>\n<ul class=\"page-generator-pro-related-links page-generator-pro-related-links-columns-1 page-generator-pro-related-links-prev-next page-generator-pro-related-links-vertical\"><li class=\"prev\">\n                            <a href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-gesso-e-drywall\/\" title=\"Fundo preparador para gesso e drywall: diferen\u00e7as e como aplicar\">Fundo preparador para gesso e drywall: diferen\u00e7as e como aplicar\n                            <\/a>\n                        <\/li><li class=\"next\">\n                            <a href=\"https:\/\/decasablog.com.br\/pintura\/fundo-preparador-para-massa-corrida\/\" title=\"Fundo preparador para massa corrida: antes ou depois? Como usar certo\">Fundo preparador para massa corrida: antes ou depois? 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