{"id":10823,"date":"2026-07-23T00:00:39","date_gmt":"2026-07-23T00:00:39","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10823"},"modified":"2026-07-23T21:11:04","modified_gmt":"2026-07-23T21:11:04","slug":"2k-pu-primer-additives","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/2k-pu-primer-additives\/","title":{"rendered":"How to Choose Surface Additives for 2K Polyurethane Primers"},"content":{"rendered":"<p><strong>R\u00e9ponse rapide :<\/strong> acheteurs travaillant sur <strong>2K polyurethane primers<\/strong> usually get a cleaner first shortlist when they separate three different jobs instead of treating every silicone additive as the same primer aid. <a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiag3467-silicone-leveling-agents\/\">CHLUMIAG\u00ae 3467<\/a> should move first when the primer still needs a <strong>compatibility-first route<\/strong> pour <strong>anti-cratering, substrate wetting, and leveling<\/strong>. <a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumife-3370\/\">CHLUMIFE\u00ae 3370<\/a> deserves earlier review when the project is a true <strong>reactive 2K PU route<\/strong> and the team wants stronger <strong>leveling, gloss-hold surface refinement, and smoothness<\/strong> inside a polyurethane crosslinking system. <a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumife-3166\/\">CHLUMIFE\u00ae 3166<\/a> belongs earlier when the primer still needs a <strong>broader balance<\/strong> of <strong>surface smoothness, substrate wettability, dry feel, anti-blocking, and gloss support<\/strong>, but the team can keep its pinhole, whitening, and foam watchpoints visible.<\/p>\n<p>That is the commercially useful split. This page is <strong>pas<\/strong> another broad coating-additives overview, and it is not a duplicate of the already-live <a href=\"https:\/\/longchangchemical.com\/fr\/2k-pu-topcoat-additives\/\">2K polyurethane topcoat<\/a> ou <a href=\"https:\/\/longchangchemical.com\/fr\/waterborne-primer-additives\/\">waterborne primer<\/a> pages. It is a <strong>new CHLUMICRYL\u00ae application page<\/strong> for buyers whose project lives specifically in the <strong>2K PU primer window<\/strong> and who need a faster first screen before moving into the finish layer.<\/p>\n<h2>Why 2K polyurethane primers deserve their own additive page<\/h2>\n<p>A 2K polyurethane primer does a different job from a topcoat, and it also lives in a different system lane from a waterborne primer. In real B2B formulation work, primer teams usually are trying to stabilize <strong>surface entry<\/strong>, <strong>crater tolerance<\/strong>, <strong>leveling<\/strong>, and a sufficiently clean surface for the next coating step, rather than chasing the same final-feel priorities that dominate a finish coat.<\/p>\n<p>That makes a stage-specific primer page worth publishing. Longchang already has broader live pages for <a href=\"https:\/\/longchangchemical.com\/fr\/chlumicryl-coating-ink-additives\/\">CHLUMICRYL\u00ae Additifs pour rev\u00eatements et encres<\/a>, <a href=\"https:\/\/longchangchemical.com\/fr\/leveling-additives-coatings-inks\/\">additifs de nivellement<\/a>, <a href=\"https:\/\/longchangchemical.com\/fr\/coating-defect-additive-selection\/\">s\u00e9lection additive bas\u00e9e sur les d\u00e9fauts<\/a>, <a href=\"https:\/\/longchangchemical.com\/fr\/waterborne-primer-additives\/\">waterborne primers<\/a>et <a href=\"https:\/\/longchangchemical.com\/fr\/2k-pu-topcoat-additives\/\">2K polyurethane topcoats<\/a>. Those pages explain the branch. This page answers the narrower question that often appears one step earlier in the line: <strong>which additive deserves the first sample round when a 2K PU primer still needs cleaner compatibility, better leveling inside a reactive PU route, or broader surface balance before topcoat?<\/strong><\/p>\n<h2>What the current company-supported evidence actually separates<\/h2>\n<ul>\n<li><strong>CHLUMIAG\u00ae 3467<\/strong> is supported by Longchang as a <strong>polysiloxane modifi\u00e9 multicomposant<\/strong> that <strong>priorise la compatibilit\u00e9 du syst\u00e8me<\/strong>. The company page directly supports <strong>anti-crat\u00e9risation<\/strong>, <strong>mouillage du substrat<\/strong>et <strong>leveling<\/strong>, with addition logic that fits either <strong>polyurethane modification<\/strong> or direct coating modification. Supported dosage is <strong>0,05% \u00e0 1%<\/strong> of total formulation for solvent systems, <strong>0,5% \u00e0 5%<\/strong> of resin amount for resin modification, and <strong>0,5% \u00e0 5%<\/strong> of total formulation for water-based systems.<\/li>\n<li><strong>CHLUMIFE\u00ae 3370<\/strong> is supported by Longchang as a <strong>reactive hydroxyl polyester-modified polysiloxane<\/strong> that <strong>reacts with isocyanate<\/strong> et est <strong>suitable for two-component polyurethane crosslinking systems<\/strong>. The company page frames it around <strong>surface leveling<\/strong>, <strong>higher gloss<\/strong>et <strong>better smoothness<\/strong>, with a supported dosage of <strong>0.05% to 3%<\/strong> of total formulation. It can be added at any stage of production or later, and the current company page supports it in <strong>Syst\u00e8mes UV et solvants<\/strong>, not water-based systems.<\/li>\n<li><strong>CHLUMIFE\u00ae 3166<\/strong> is supported as a <strong>polyorganosiloxane modifi\u00e9 par poly\u00e9ther<\/strong> pour <strong>Syst\u00e8mes \u00e0 base d&#039;UV, de solvants et d&#039;eau<\/strong>. Longchang supports reduced surface tension, <strong>mouillabilit\u00e9 du substrat<\/strong>, <strong>rugosit\u00e9 de surface<\/strong>, <strong>r\u00e9sistance aux rayures<\/strong>, <strong>anti-blocage<\/strong>, <strong>leveling<\/strong>, <strong>am\u00e9lioration du brillant<\/strong>, and especially <strong>excellente sensation de sec<\/strong>La dose recommand\u00e9e est <strong>0,05% \u00e0 1%<\/strong>, with explicit cautions around <strong>pinholes<\/strong>, <strong>whitening<\/strong>, and possible <strong>foam stabilization<\/strong>.<\/li>\n<\/ul>\n<p>That is enough company-supported separation to build a real buyer page. External framing is used only conservatively for the general industry point that a 2K PU primer additive decision usually splits into <strong>compatibility-first defect cleanup<\/strong>, <strong>reactive primer leveling inside the PU route<\/strong>et <strong>broader surface-balance work before the finish layer<\/strong>.<\/p>\n<h2>Tableau comparatif rapide\u00a0: quel itin\u00e9raire m\u00e9rite la premi\u00e8re place\u00a0?<\/h2>\n<table>\n<thead>\n<tr>\n<th>Buyer priority in 2K PU primers<\/th>\n<th>Meilleur premier itin\u00e9raire<\/th>\n<th>Pourquoi cela devrait \u00eatre la premi\u00e8re chose \u00e0 faire<\/th>\n<th>Point de surveillance principal<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Compatibility-first anti-cratering, substrate-wetting, and leveling control in a more formulation-sensitive primer package<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiag3467-silicone-leveling-agents\/\">CHLUMIAG\u00ae 3467<\/a><\/td>\n<td>Longchang explicitly prioritizes system compatibility and supports anti-cratering, wetting, and leveling, plus polyurethane-modification use<\/td>\n<td>Its supported caution is that the feel is slightly less refined when compared with more feel-led routes<\/td>\n<\/tr>\n<tr>\n<td>Reactive 2K PU leveling and smoother primer-surface preparation before the finish layer<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumife-3370\/\">CHLUMIFE\u00ae 3370<\/a><\/td>\n<td>Longchang positions it for two-component polyurethane crosslinking systems and ties it to leveling, gloss, and smoothness<\/td>\n<td>Keep the system boundary visible because the current company page supports UV and solvent routes, not water-based systems<\/td>\n<\/tr>\n<tr>\n<td>Broader surface balance across wettability, smoothness, dry feel, anti-blocking, leveling, and gloss support<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumife-3166\/\">CHLUMIFE\u00ae 3166<\/a><\/td>\n<td>Longchang supports it across UV, solvent, and water-based systems with a wider surface-performance balance<\/td>\n<td>Pinhole, whitening, and foam-stabilization risk should be screened early<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Quand CHLUMIAG\u00ae 3467 est le meilleur premier pas<\/h2>\n<p>3467 should move first when the 2K PU primer still looks <strong>compatibility-sensitive<\/strong> and the main question is whether the team can stabilize <strong>anti-cratering, substrate wetting, and leveling<\/strong> without narrowing the formulation window too fast. Longchang\u2019s current product page is unusually helpful here because it does not position 3467 only as a generic leveling aid. It explicitly says the product <strong>priorise la compatibilit\u00e9 du syst\u00e8me<\/strong>, and it also supports use for <strong>polyurethane modification<\/strong>.<\/p>\n<p>That matters in 2K primer work. Some primer programs are not failing because the lab chose the wrong surface family in the abstract. They are failing because the system is still sensitive and the first screen needs a route that keeps formulation tolerance visible while still addressing crater and wetting pressure.<\/p>\n<ul>\n<li><strong>Supported strengths:<\/strong> anti-cratering, substrate wetting, leveling, and compatibility-first behavior<\/li>\n<li><strong>Addition logic:<\/strong> can be added with the polyol during resin prepolymerization, added later in polyurethane modification, or added directly to the coating system<\/li>\n<li><strong>System fit:<\/strong> Syst\u00e8mes \u00e0 base d&#039;UV, de solvants et d&#039;eau<\/li>\n<li><strong>Main caution:<\/strong> Longchang notes that the feel is slightly less refined, so it should not be the automatic first choice if the project already has moved into a more feel-led or premium-finish target<\/li>\n<\/ul>\n<p>In short, 3467 is the cleaner first screen when the primer team needs <strong>compatibility-first control<\/strong> before worrying about a more reactive or broader feel-balance route.<\/p>\n<h2>When CHLUMIFE\u00ae 3370 is the better first move<\/h2>\n<p>3370 should move earlier when the buyer is working on a <strong>true reactive 2K polyurethane route<\/strong> and wants the additive choice to stay inside that system logic. Longchang supports 3370 as a <strong>reactive hydroxyl polyester-modified polysiloxane<\/strong> that <strong>reacts with isocyanate<\/strong> so the organosilicon can combine with the resin system in block or graft form. The company page also says it is <strong>suitable for two-component polyurethane crosslinking systems<\/strong>.<\/p>\n<p>That makes 3370 commercially useful when the primer already is clearly a 2K PU system and the first question is not only broad wetting correction. It is whether the lab can achieve <strong>better leveling, smoother primer laydown, and a cleaner surface before the next coating stage<\/strong> without stepping outside the reactive polyurethane route.<\/p>\n<ul>\n<li><strong>Supported strengths:<\/strong> leveling, higher gloss, and better smoothness<\/li>\n<li><strong>Recommended dosage:<\/strong> 0.05% to 3% of total formulation<\/li>\n<li><strong>Addition logic:<\/strong> can be added at any stage of production or later<\/li>\n<li><strong>System fit:<\/strong> supported in UV and solvent systems, not water-based systems on the current company page<\/li>\n<\/ul>\n<p>So 3370 is the better first benchmark when the buyer needs a <strong>reactive 2K PU primer route<\/strong> rather than a more compatibility-led or broader multi-system route.<\/p>\n<h2>Quand CHLUMIFE\u00ae 3166 est le meilleur premier pas<\/h2>\n<p>3166 deserves earlier review when the primer still needs a <strong>broader surface-balance route<\/strong> before the topcoat stage. Longchang\u2019s company page positions 3166 around <strong>contr\u00f4le de la tension superficielle<\/strong>, <strong>excellente sensation de sec<\/strong>, <strong>mouillabilit\u00e9 du substrat<\/strong>, <strong>rugosit\u00e9 de surface<\/strong>, <strong>anti-blocage<\/strong>, <strong>leveling<\/strong>et <strong>am\u00e9lioration du brillant<\/strong>. That is a different first-screen role from 3467\u2019s compatibility-first logic or 3370\u2019s reactive-PU route.<\/p>\n<p>This makes 3166 useful when the primer problem is still broader than one narrow crater or reactive-chemistry decision. Some teams need a first route that helps them judge whether the primer surface can become cleaner, smoother, and easier to handle before they narrow into a more specialized option.<\/p>\n<ul>\n<li><strong>Supported strengths:<\/strong> substrate wettability, surface smoothness, anti-blocking, leveling, gloss support, and excellent dry feel<\/li>\n<li><strong>Recommended dosage:<\/strong> 0,05% \u00e0 1% de la formulation totale<\/li>\n<li><strong>Addition logic:<\/strong> can be added at any stage, and can be diluted first for easier addition<\/li>\n<li><strong>Main caution:<\/strong> Longchang explicitly warns about pinholes, whitening, and possible foam stabilization, so a defoamer check should stay visible during qualification<\/li>\n<\/ul>\n<p>That makes 3166 the better first route when the lab still needs a <strong>broader primer-surface read<\/strong> before it narrows into a tighter compatibility or reactive-system decision.<\/p>\n<h2>Comment les acheteurs doivent-ils choisir avant la premi\u00e8re s\u00e9rie d&#039;\u00e9chantillons\u00a0?<\/h2>\n<h3>1. Start with the real stage of failure<\/h3>\n<p>If the primer still looks compatibility-sensitive and crater-prone, start with 3467. If the line already is clearly a 2K PU reactive route and needs a cleaner primer surface before the finish layer, move 3370 earlier. If the primer still needs a broader balance across wettability, smoothness, and handling, start with 3166.<\/p>\n<h3>2. Gardez la limite du syst\u00e8me visible.<\/h3>\n<p>3467 and 3166 both sit across wider system windows. 3370 does not. That alone can save time when the team is screening more than one primer route in parallel.<\/p>\n<h3>3. Keep compatibility logic separate from reactive-route logic<\/h3>\n<p>Both 3467 and 3370 can touch leveling, but the supported selection logic is not the same. One is a compatibility-first route. The other is a reactive polyurethane route tied directly to isocyanate-crosslinking systems.<\/p>\n<h3>4. Use the watchpoint, not only the headline benefit<\/h3>\n<p>3467 keeps formulation tolerance visible but is not the most feel-led option. 3370 is best treated as a true 2K PU route, not a general water-based shortcut. 3166 can be broad and useful, but its pinhole, whitening, and foam watchpoints should be screened early.<\/p>\n<h3>5. Keep the first round tight<\/h3>\n<p>For many 2K PU primer projects, one <strong>compatibility-first route<\/strong>, un <strong>reactive PU route<\/strong>et un <strong>broader surface-balance route<\/strong> teach more than an overloaded first panel packed with near-neighbor additives.<\/p>\n<h2>Itin\u00e9raire recommand\u00e9 pour Longchang \u00e0 partir de cette page<\/h2>\n<ul>\n<li><strong>Aper\u00e7u du cluster\u00a0:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/chlumicryl-coating-ink-additives\/\">CHLUMICRYL\u00ae Additifs pour rev\u00eatements et encres<\/a><\/li>\n<li><strong>Related stage-specific page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/waterborne-primer-additives\/\">How to Choose Additives for Waterborne Primers<\/a><\/li>\n<li><strong>Related finish-layer page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/2k-pu-topcoat-additives\/\">How to Choose Surface Additives for 2K Polyurethane Topcoats<\/a><\/li>\n<li><strong>Page de fonction associ\u00e9e\u00a0:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/leveling-additives-coatings-inks\/\">Comment choisir les additifs de nivellement pour les rev\u00eatements et les encres<\/a><\/li>\n<li><strong>Related diagnosis page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/coating-defect-additive-selection\/\">Additifs mouillants vs additifs de nivellement vs antimousses vs tensioactifs fluor\u00e9s dans les rev\u00eatements et les encres<\/a><\/li>\n<li><strong>3467 product page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiag3467-silicone-leveling-agents\/\">CHLUMIAG\u00ae 3467<\/a><\/li>\n<li><strong>3370 product page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumife-3370\/\">CHLUMIFE\u00ae 3370<\/a><\/li>\n<li><strong>3166 product page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumife-3166\/\">CHLUMIFE\u00ae 3166<\/a><\/li>\n<\/ul>\n<h2>FAQ<\/h2>\n<h3>Which additive should I screen first if my 2K PU primer still shows crater risk and formulation sensitivity?<\/h3>\n<p>Usually CHLUMIAG\u00ae 3467, because Longchang directly supports it around compatibility-first use, anti-cratering, substrate wetting, leveling, and polyurethane-modification routes.<\/p>\n<h3>When should 3370 move ahead of 3467?<\/h3>\n<p>3370 should move ahead when the project is clearly a reactive two-component polyurethane route and the main target is cleaner leveling and surface refinement inside that PU crosslinking system.<\/p>\n<h3>When does 3166 make more sense than the other two?<\/h3>\n<p>It makes more sense when the primer still needs a broader surface-balance screen across wettability, smoothness, anti-blocking, and handling, rather than only a compatibility-first or reactive-system decision.<\/p>\n<h3>Is this page the same as the 2K PU topcoat page?<\/h3>\n<p>No. The topcoat page is built around finish-layer selection logic. This new page is for the primer stage and helps buyers screen compatibility-first crater control, reactive primer leveling, and broader pre-topcoat surface balance.<\/p>\n<h2>Need a faster shortlist for 2K polyurethane primers?<\/h2>\n<p>If your primer project is stuck between <strong>compatibility-first defect cleanup<\/strong>, <strong>reactive PU leveling<\/strong>et <strong>broader surface balance before topcoat<\/strong>, define the real first-screen job before requesting samples. That usually shows much faster whether 3467, 3370, or 3166 deserves the first round.<\/p>","protected":false},"excerpt":{"rendered":"<p>A practical CHLUMICRYL\u00ae buyer guide for 2K polyurethane primers that separates compatibility-first crater control, reactive PU leveling, and broader surface-balance screening before the topcoat stage.<\/p>","protected":false},"author":6,"featured_media":10824,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10823","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>2K Polyurethane Primer Additives | Compatibility, Leveling, and Surface Balance<\/title>\n<meta name=\"description\" content=\"Learn how to choose CHLUMICRYL\u00ae additives 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