{"id":10875,"date":"2026-07-26T00:00:13","date_gmt":"2026-07-26T00:00:13","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10875"},"modified":"2026-07-26T07:07:41","modified_gmt":"2026-07-26T07:07:41","slug":"2k-pu-basecoat-additives","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/tr\/2k-pu-basecoat-additives\/","title":{"rendered":"How to Choose Additives for 2K Polyurethane Basecoats"},"content":{"rendered":"<p><strong>H\u0131zl\u0131 cevap:<\/strong> al\u0131c\u0131lar \u00fczerinde \u00e7al\u0131\u015f\u0131yor <strong>2K polyurethane basecoats<\/strong> usually get a cleaner first shortlist when they separate three different additive jobs instead of asking one silicone route to solve every surface problem at once. <a href=\"https:\/\/longchangchemical.com\/tr\/product\/chlumiwe-3071-organic-silicone-surfactant-organosilicone-wetting-agent\/\">CHLUMIWE\u00ae 3071<\/a> should move first when the basecoat still needs <strong>better substrate wetting, spread, and first-contact entry<\/strong>. <a href=\"https:\/\/longchangchemical.com\/tr\/product\/chlumiag3467-silicone-leveling-agents\/\">CHLUMIAG\u00ae 3467<\/a> deserves earlier review when the system is still <strong>compatibility-sensitive<\/strong> and the main pressure sits around <strong>anti-cratering, pullback control, and broader leveling stability<\/strong>. <a href=\"https:\/\/longchangchemical.com\/tr\/product\/chlumife-3370\/\">CHLUMIFE\u00ae 3370<\/a> belongs earlier when the buyer already is in a true <strong>2K polyurethane crosslinking route<\/strong> and wants a <strong>reactive leveling and gloss-hold path<\/strong> before the finish layer.<\/p>\n<p>That is the commercially useful split. This page is intentionally narrower than Longchang\u2019s already-live <a href=\"https:\/\/longchangchemical.com\/tr\/2k-pu-primer-additives\/\">2K polyurethane primer<\/a>, <a href=\"https:\/\/longchangchemical.com\/tr\/2k-pu-topcoat-additives\/\">2K polyurethane topcoat<\/a>, ve <a href=\"https:\/\/longchangchemical.com\/tr\/2k-pu-clearcoat-additives\/\">2K polyurethane clearcoat<\/a> pages. Those pages solve adjacent stage questions. This new page answers the tighter B2B decision that sits in the middle: <strong>which additive route deserves the first sample round when the 2K PU basecoat still is not laying down cleanly enough before the next layer?<\/strong><\/p>\n<h2>Why 2K polyurethane basecoats deserve their own additive page<\/h2>\n<p>A basecoat is not judged the same way as a primer or a final clear layer. In many practical polyurethane coating builds, the basecoat is the appearance-setting middle layer. Buyers usually care about whether the film wets the substrate cleanly, whether crater or pullback risk is under control, and whether the basecoat can level well enough before the next coating step locks in the result.<\/p>\n<p>That makes a dedicated basecoat page worth publishing. Longchang already has broader live pages for the <a href=\"https:\/\/longchangchemical.com\/tr\/chlumicryl-coating-ink-additives\/\">CHLUMICRYL\u00ae Kaplama ve M\u00fcrekkep Katk\u0131lar\u0131<\/a> hub, the cross-function <a href=\"https:\/\/longchangchemical.com\/tr\/coating-defect-additive-selection\/\">coating defect additive selection<\/a> page, and the stage-neighbor pages for 2K PU primers, topcoats, and clearcoats. Those pages explain the larger branch. This page answers a narrower buyer question: <strong>should the first additive decision in a 2K PU basecoat focus on substrate entry, compatibility-first crater cleanup, or reactive leveling inside the polyurethane route?<\/strong><\/p>\n<p>General industry framing also supports that split. External coating references commonly separate wetting and substrate-entry problems from crater-sensitive compatibility issues and from final leveling inside a reactive PU build. That outside framing is used here only conservatively. The product-specific facts below stay tied to Longchang-supported product pages.<\/p>\n<h2>What the current company-supported evidence already separates<\/h2>\n<ul>\n<li><strong>CHLUMIWE\u00ae 3071<\/strong> is supported by Longchang as a <strong>polieter modifiye polisiloksan<\/strong> ile <strong>low viscosity<\/strong> ve <strong>low surface tension<\/strong>, providing <strong>excellent spreadability, wetting, and penetration<\/strong>. The current company page also frames it as useful on difficult-to-process substrates and says it can improve <strong>flow, leveling, recoatability, and gloss retention<\/strong>. Supported dosage is <strong>0.1% ile 1.0% aras\u0131<\/strong>, and the product can be added during grinding, stirring, or after production.<\/li>\n<li><strong>CHLUMIAG\u00ae 3467<\/strong> is supported by Longchang as a <strong>reaktif tesviye maddesi<\/strong> ve <strong>\u00e7ok bile\u015fenli modifiye polisiloksan<\/strong>. The company page states that it can graft onto polyurethane resins through reaction of its <strong>hydroxyl groups with isocyanates<\/strong> and directly supports <strong>leveling, anti-cratering, and substrate wetting<\/strong>. It is also positioned around polyurethane modification or direct coating modification. Supported dosage is <strong>0.05% ile 1% aras\u0131<\/strong> of total formulation for solvent systems and <strong>0.5% - 5%<\/strong> for resin modification or water-based systems.<\/li>\n<li><strong>CHLUMIFE\u00ae 3370<\/strong> is supported by Longchang as a <strong>reactive hydroxyl polyester-modified polysiloxane<\/strong>. The current company page says it reacts with <strong>isocyanate<\/strong>, is suitable for <strong>two-component polyurethane crosslinking systems<\/strong>, and improves <strong>surface leveling, gloss, and smoothness<\/strong>. Supported dosage is <strong>0.05% to 3%<\/strong> of total formulation, and the page keeps it in <strong>UV ve \u00e7\u00f6z\u00fcc\u00fc sistemleri<\/strong>, not water-based systems.<\/li>\n<\/ul>\n<p>That is enough company-supported separation to build a real 2K PU basecoat buyer page without inventing unsupported resin chemistry or application claims.<\/p>\n<h2>H\u0131zl\u0131 kar\u015f\u0131la\u015ft\u0131rma tablosu: Hangi rota ilk ekranda yer almay\u0131 hak ediyor?<\/h2>\n<table>\n<thead>\n<tr>\n<th>Observed 2K PU basecoat situation<\/th>\n<th>En iyi ilk rota<\/th>\n<th>Neden ilk s\u0131rada yer al\u0131yor?<\/th>\n<th>Ana g\u00f6zetleme noktas\u0131<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>The basecoat still struggles with surface entry, spread, or uniform first-contact laydown before the team can honestly judge crater behavior<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/tr\/product\/chlumiwe-3071-organic-silicone-surfactant-organosilicone-wetting-agent\/\">CHLUMIWE\u00ae 3071<\/a><\/td>\n<td>Longchang supports it directly around low surface tension, spreadability, wetting, penetration, and broader flow or recoatability support<\/td>\n<td>Its company page notes a possible foam-stabilizing effect, so buyers should keep that risk visible during formulation screening<\/td>\n<\/tr>\n<tr>\n<td>The system already is in a polyurethane route but still looks compatibility-sensitive, with crater, pullback, or broader leveling instability<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/tr\/product\/chlumiag3467-silicone-leveling-agents\/\">CHLUMIAG\u00ae 3467<\/a><\/td>\n<td>Longchang positions it as a reactive leveling route that can graft into polyurethane systems and supports anti-cratering, substrate wetting, and leveling together<\/td>\n<td>The company page says it prioritizes compatibility, so buyers chasing a more refined hand feel may still need a later finish-layer check<\/td>\n<\/tr>\n<tr>\n<td>The 2K PU basecoat route already fits directionally, but the film still needs cleaner reactive leveling, gloss hold, and smoother appearance before the next layer<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/tr\/product\/chlumife-3370\/\">CHLUMIFE\u00ae 3370<\/a><\/td>\n<td>Longchang supports it specifically for two-component polyurethane crosslinking systems, with reactive isocyanate-linked leveling, gloss, and smoothness<\/td>\n<td>The current company page does not position it for water-based systems, so keep it inside the supported system window<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>CHLUMIWE\u00ae 3071, ilk ad\u0131m olarak daha iyi bir se\u00e7imdir.<\/h2>\n<p>3071 should move first when the basecoat still has not entered the substrate cleanly enough. This is the better route when the film shows weak spread, unstable first-contact coverage, or a laydown problem that appears before the team can even judge whether crater control or reactive leveling is the real next bottleneck.<\/p>\n<p>That supported logic matters because Longchang does not position 3071 only as a vague wetting additive. The current company page keeps together <strong>low surface tension<\/strong>, <strong>spreadability<\/strong>, <strong>wetting<\/strong>, <strong>penetration<\/strong>, and broader support around <strong>flow, leveling, recoatability, and gloss retention<\/strong>.<\/p>\n<p>3071 is usually the better first route when:<\/p>\n<ul>\n<li>the basecoat still is not entering the substrate or previous layer cleanly,<\/li>\n<li>the film lays down unevenly before a more specific crater diagnosis is even possible,<\/li>\n<li>the buyer wants a first screen that improves surface entry without jumping immediately into a stronger reactive or compatibility-first route, or<\/li>\n<li>the project needs a faster wetting benchmark before moving into more specialized PU additive decisions.<\/li>\n<\/ul>\n<p>The watchpoint stays practical. Longchang notes that 3071 may have a <strong>k\u00f6p\u00fck dengeleyici etki<\/strong>, so the lab should not ignore air-release behavior while screening it.<\/p>\n<h2>CHLUMIAG\u00ae 3467&#039;nin ilk tercih olarak daha iyi oldu\u011fu durumlar<\/h2>\n<p>3467 deserves the earlier screen when the 2K PU basecoat already sits inside the right polyurethane lane but still behaves as a <strong>compatibility-sensitive surface problem<\/strong>. This is the stronger first route when the basecoat shows crater risk, pullback, or unstable leveling that is harder to solve with simple wetting correction alone.<\/p>\n<p>The current Longchang-supported page is direct here. 3467 is not positioned only as a general silicone. It is described as a <strong>reaktif tesviye maddesi<\/strong> \u00fczerine a\u015f\u0131lanabilen <strong>polyurethane resins<\/strong> through reaction of its hydroxyl groups with isocyanates. The same page also supports <strong>anti-cratering, substrate wetting, and leveling<\/strong>, which is exactly why it earns a compatibility-first place in a 2K PU basecoat shortlist.<\/p>\n<p>3467 is usually the better first route when:<\/p>\n<ul>\n<li>the basecoat still shows crater, pullback, or anti-cratering pressure inside a PU system,<\/li>\n<li>simple wetting correction is not enough because the package still looks formulation-sensitive,<\/li>\n<li>the buyer wants one first screen that keeps together leveling, crater control, and substrate wetting, or<\/li>\n<li>the development path may include <strong>polyurethane modification<\/strong> rather than only late direct addition.<\/li>\n<\/ul>\n<p>This route is especially useful when the basecoat is not failing because of one isolated surface symptom, but because the full polyurethane surface-control window still is not stable enough.<\/p>\n<h2>When CHLUMIFE\u00ae 3370 is the better first move<\/h2>\n<p>3370 belongs earlier when the 2K polyurethane basecoat already is broadly compatible, but the team still needs a more specific <strong>reactive leveling and appearance-control route<\/strong> before the next layer. This is the stronger route when the buyer wants cleaner flow-out, smoother appearance, and better gloss hold inside a true <strong>two-component polyurethane crosslinking system<\/strong>.<\/p>\n<p>The supported company evidence is narrow but useful. Longchang positions 3370 as a <strong>reactive hydroxyl polyester-modified polysiloxane<\/strong> that reacts with <strong>isocyanate<\/strong>, is suitable for <strong>two-component polyurethane crosslinking systems<\/strong>, and improves <strong>surface leveling, gloss, and smoothness<\/strong>. That is the cleaner fit when the basecoat already wets directionally and the next question is how to refine its reactive appearance before the finish layer.<\/p>\n<p>3370 is usually the better first route when:<\/p>\n<ul>\n<li>the coating line already is committed to a true 2K PU route,<\/li>\n<li>the basecoat needs smoother flow and better visible appearance rather than only broader wetting correction,<\/li>\n<li>the lab wants a more specifically <strong>reactive PU leveling benchmark<\/strong>, veya<\/li>\n<li>the next coating step will expose any remaining roughness or weak laydown too clearly to ignore.<\/li>\n<\/ul>\n<p>The boundary matters. The current company page keeps 3370 in <strong>UV ve \u00e7\u00f6z\u00fcc\u00fc sistemleri<\/strong>, not water-based systems, so buyers should keep the first screen inside that supported window.<\/p>\n<h2>How buyers should choose before the first sample round<\/h2>\n<h3>1. Decide whether the basecoat problem starts with entry, compatibility, or reactive leveling<\/h3>\n<p>If the film still cannot spread or enter cleanly, start with 3071. If the surface already enters but still shows crater-sensitive instability, move earlier to 3467. If the package is directionally right and the main target becomes smoother reactive appearance before the next layer, 3370 deserves the earlier test.<\/p>\n<h3>2. Keep the stage logic separate from primer and topcoat logic<\/h3>\n<p>Do not force a primer-style or clearcoat-style answer onto a basecoat. The basecoat usually has to become uniform enough for the next layer, so the first additive decision should match that middle-stage job instead of repeating a general coating article.<\/p>\n<h3>3. Keep the polyurethane route visible<\/h3>\n<p>3467 and 3370 are both commercially useful here because the company-supported pages keep them attached to polyurethane logic rather than only generic silicone language. If the trial plan ignores whether the route is a true 2K PU system, the comparison becomes less useful.<\/p>\n<h3>4. Keep watchpoints inside the first trial design<\/h3>\n<p>3071 may stabilize foam. 3467 prioritizes compatibility more than refined feel. 3370 is not positioned by Longchang for water-based systems. Those watchpoints should sit inside the first panel plan instead of being rediscovered later.<\/p>\n<h3>5. Keep the first sample set small<\/h3>\n<p>For many 2K PU basecoat projects, a practical first plan is one <strong>3071 substrate-entry route<\/strong>, bir <strong>3467 compatibility-first crater-control route<\/strong>ve bir <strong>3370 reactive leveling route<\/strong>. That usually teaches more than screening a crowded set of near-neighbor additives without a clear decision frame.<\/p>\n<h2>Bu sayfadan Longchan g\u00fczergah\u0131 \u00f6nerisi.<\/h2>\n<ul>\n<li><strong>Substrate wetting route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/product\/chlumiwe-3071-organic-silicone-surfactant-organosilicone-wetting-agent\/\">CHLUMIWE\u00ae 3071<\/a><\/li>\n<li><strong>Compatibility-first crater-control route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/product\/chlumiag3467-silicone-leveling-agents\/\">CHLUMIAG\u00ae 3467<\/a><\/li>\n<li><strong>Reactive PU leveling route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/product\/chlumife-3370\/\">CHLUMIFE\u00ae 3370<\/a><\/li>\n<li><strong>K\u00fcme genel bak\u0131\u015f\u0131:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/chlumicryl-coating-ink-additives\/\">CHLUMICRYL\u00ae Kaplama ve M\u00fcrekkep Katk\u0131lar\u0131<\/a><\/li>\n<li><strong>Related stage page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/2k-pu-primer-additives\/\">How to Choose Surface Additives for 2K Polyurethane Primers<\/a><\/li>\n<li><strong>Related stage page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/2k-pu-topcoat-additives\/\">2K Poli\u00fcretan Son Kat Boyalar \u0130\u00e7in Y\u00fczey Katk\u0131 Maddeleri Nas\u0131l Se\u00e7ilir?<\/a><\/li>\n<li><strong>Related stage page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/2k-pu-clearcoat-additives\/\">How to Choose Surface Additives for 2K Polyurethane Clearcoats<\/a><\/li>\n<li><strong>\u0130lgili hata sayfas\u0131:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/coating-defect-additive-selection\/\">Kaplama ve M\u00fcrekkeplerde Islat\u0131c\u0131 Katk\u0131 Maddesi, D\u00fczle\u015ftirici Katk\u0131 Maddesi, K\u00f6p\u00fck Giderici ve Florlu Y\u00fczey Aktif Madde Kar\u015f\u0131la\u015ft\u0131rmas\u0131<\/a><\/li>\n<li><strong>\u0130lgili fonksiyon sayfas\u0131:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/leveling-additives-coatings-inks\/\">Boya ve M\u00fcrekkepler \u0130\u00e7in D\u00fczle\u015ftirici Katk\u0131 Maddeleri Nas\u0131l Se\u00e7ilir?<\/a><\/li>\n<\/ul>\n<h2>SSS<\/h2>\n<h3>What is the best first additive if the 2K PU basecoat still does not wet cleanly?<\/h3>\n<p>Usually 3071, especially when the visible problem still starts with spread, penetration, and first-contact laydown rather than a clearly reactive PU leveling issue.<\/p>\n<h3>When should I test 3467 before 3370?<\/h3>\n<p>Test 3467 earlier when the basecoat still looks compatibility-sensitive and crater-prone. Test 3370 earlier when the package already is directionally stable and the remaining target is smoother reactive leveling and gloss hold.<\/p>\n<h3>Why is 3370 not the first answer for every 2K PU basecoat?<\/h3>\n<p>Because some basecoat failures start before reactive appearance refinement matters. If the film still is not entering the surface or still is cratering from a broader compatibility issue, 3071 or 3467 may teach the lab more in the first round.<\/p>\n<h3>Can one of these routes solve every basecoat defect?<\/h3>\n<p>No. Their supported first-screen jobs are different enough that buyers should not treat them as interchangeable. The faster path is to identify whether the basecoat is failing at substrate entry, compatibility-sensitive crater control, or reactive leveling.<\/p>\n<h3>Is this page meant for water-based 2K PU basecoats too?<\/h3>\n<p>Only partly. 3071 and 3467 both have company-supported water-based windows. 3370 does not. So buyers should keep the supported system boundary visible instead of assuming all three routes are interchangeable in water-based 2K PU work.<\/p>\n<h2>Daha dar bir aday listesi mi gerekiyor?<\/h2>\n<p>If your <strong>2K polyurethane basecoat<\/strong> still is not laying down cleanly, stop treating it as one generic silicone-additive problem. First decide whether the real bottleneck is <strong>substrate wetting and spread<\/strong>, <strong>compatibility-first crater cleanup<\/strong>, veya <strong>reactive PU leveling before the finish layer<\/strong>. That usually makes the next CHLUMICRYL\u00ae sample decision much faster.<\/p>","protected":false},"excerpt":{"rendered":"<p>A practical CHLUMICRYL\u00ae buyer guide for 2K polyurethane basecoats that separates substrate wetting, compatibility-first crater cleanup, and reactive leveling before the finish layer.<\/p>","protected":false},"author":6,"featured_media":10876,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10875","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Choose Additives for 2K Polyurethane Basecoats | CHLUMICRYL\u00ae Guide<\/title>\n<meta name=\"description\" content=\"Choose CHLUMICRYL\u00ae additives for 2K polyurethane basecoats by separating 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