{"id":10792,"date":"2026-07-22T00:00:31","date_gmt":"2026-07-22T00:00:31","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10792"},"modified":"2026-07-22T07:09:58","modified_gmt":"2026-07-22T07:09:58","slug":"waterborne-primer-additives","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/nl\/waterborne-primer-additives\/","title":{"rendered":"How to Choose Additives for Waterborne Primers"},"content":{"rendered":"<p><strong>Snel antwoord:<\/strong> buyers developing <strong>waterborne primers<\/strong> usually get to a better first shortlist when they stop asking for one additive to fix every surface problem and instead separate three different jobs. <a href=\"https:\/\/longchangchemical.com\/nl\/product\/agesin-wd-d545\/\">CHLUMICRYL\u00ae WD-D545<\/a> should move first when the primer is still struggling with <strong>substrate entry, wetting, and spreading<\/strong>. <a href=\"https:\/\/longchangchemical.com\/nl\/product\/agesin-wd-d547-wetting-agent\/\">CHLUMICRYL\u00ae WD-D547<\/a> deserves the earlier screen when the coating team needs a <strong>broader wetting-plus-leveling route<\/strong> with direct support for <strong>anti-kratervorming<\/strong> en <strong>recoating<\/strong>. <a href=\"https:\/\/longchangchemical.com\/nl\/product\/agesin-we-d9904br-defoamer\/\">CHLUMICRYL\u00ae DF-D9904BR<\/a> is the cleaner first route when the real pressure is <strong>foam, microbubbles, or pinholes<\/strong> in a water-based primer process.<\/p>\n<p>That is the commercially useful split. This page is not another broad industrial-coating overview and it is not a return to the older photoinitiator cluster. It is a <strong>new CHLUMICRYL\u00ae application page<\/strong> for primer buyers who need to decide whether the first trial should solve <strong>surface entry<\/strong>, <strong>film-settling defects<\/strong>, of <strong>process-side air management<\/strong>.<\/p>\n<h2>Why waterborne primers deserve their own additive page<\/h2>\n<p>Waterborne primers are often judged before the topcoat ever gets a chance. If the primer does not wet the substrate cleanly, if the applied film pulls back or craters, or if microbubbles stay trapped through drying, downstream appearance and adhesion work can get harder to read. In ordinary formulation practice, that means buyers often need to separate an early <strong>wetting problem<\/strong> from a broader <strong>leveling or crater-control problem<\/strong>, and both from a true <strong>defoaming problem<\/strong>.<\/p>\n<p>Longchang already has broader guidance for the <a href=\"https:\/\/longchangchemical.com\/nl\/chlumicryl-coating-ink-additives\/\">CHLUMICRYL\u00ae coating- en inktadditieven<\/a> hub, plus live support pages for <a href=\"https:\/\/longchangchemical.com\/nl\/wetting-additives-coatings-inks\/\">bevochtigingsmiddelen<\/a>, <a href=\"https:\/\/longchangchemical.com\/nl\/defoamers-coatings-inks\/\">ontschuimers<\/a>, <a href=\"https:\/\/longchangchemical.com\/nl\/waterborne-industrial-coating-additives\/\">waterborne industrial coatings<\/a>, <a href=\"https:\/\/longchangchemical.com\/nl\/waterborne-direct-to-metal-additives\/\">waterborne direct-to-metal coatings<\/a>, En <a href=\"https:\/\/longchangchemical.com\/nl\/uv-primer-anti-cratering\/\">UV primer anti-cratering<\/a>. Those pages help buyers understand the larger family logic. This page answers the narrower B2B question that comes up sooner in a primer lab: <strong>which additive deserves the first sample round when the primer still needs cleaner substrate contact, better film settling, or lower bubble carry-through?<\/strong><\/p>\n<h2>What the current company-supported evidence actually separates<\/h2>\n<ul>\n<li><strong>WD-D545<\/strong> is supported as a <strong>polyether-gemodificeerd polydimethylsiloxaan<\/strong> wetting agent for <strong>water-borne wood, industrial, and plastic paint<\/strong>. Longchang states that it can <strong>most effectively reduce surface tension<\/strong>, heeft <strong>excellent wetting and spreading ability<\/strong>, and can reduce water surface tension to <strong>20.5 mN\/m at 0.2% addition<\/strong>. The supported addition range is <strong>0,1% tot 0,5%<\/strong>, and the product can be incorporated during any stage of production, including post-addition.<\/li>\n<li><strong>WD-D547<\/strong> is supported as a <strong>polyether-gemodificeerd polydimethylsiloxaan<\/strong> wetting agent for <strong>water-borne, solvent, solvent-free, and UV-cure paints<\/strong>. Longchang supports <strong>uitstekende bevochtiging en verspreiding<\/strong> together with direct performance notes around <strong>anti-kratervorming<\/strong>, <strong>re-coating<\/strong>, <strong>ontschuimend<\/strong>, En <strong>nivellering<\/strong>. The supported addition range is <strong>0,1% tot 0,5%<\/strong>, and the additive can be added directly or diluted before addition.<\/li>\n<li><strong>DF-D9904BR<\/strong> is supported as a <strong>polyether modified polysiloxane compound<\/strong>, <strong>silica-free<\/strong>, for <strong>op water gebaseerde systemen<\/strong>. Longchang directly positions it around <strong>preventing microbubbles and pinholes<\/strong> in the coating film of water-based coatings and inks. The supported addition range is <strong>0,1% tot 1,0%<\/strong>, and the product should be added <strong>under high shear<\/strong>, ideally after first going into a co-solvent rather than being dropped in late.<\/li>\n<\/ul>\n<p>That is enough company-supported separation to build a real buyer page without inventing unsupported primer claims.<\/p>\n<h2>Snelle vergelijkingstabel: welke route verdient de eerste plek op het scherm?<\/h2>\n<table>\n<thead>\n<tr>\n<th>Buyer priority<\/th>\n<th>WD-D545<\/th>\n<th>WD-D547<\/th>\n<th>DF-D9904BR<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Main first-screen job<\/td>\n<td>Substrate-entry wetting and spreading<\/td>\n<td>Broader wetting plus anti-cratering and recoating balance<\/td>\n<td>Water-based foam, microbubble, and pinhole control<\/td>\n<\/tr>\n<tr>\n<td>Supported dosage<\/td>\n<td>0,1% tot 0,5%<\/td>\n<td>0,1% tot 0,5%<\/td>\n<td>0,1% tot 1,0%<\/td>\n<\/tr>\n<tr>\n<td>System window<\/td>\n<td>Verf op waterbasis voor hout, industrie en kunststoffen<\/td>\n<td>Water-borne, solvent, solvent-free, and UV-cure paints<\/td>\n<td>Systemen op waterbasis<\/td>\n<\/tr>\n<tr>\n<td>Optellogica<\/td>\n<td>Any production stage, including post-addition<\/td>\n<td>Direct addition or dilution before addition<\/td>\n<td>Add under high shear, preferably through a co-solvent step<\/td>\n<\/tr>\n<tr>\n<td>Best use when<\/td>\n<td>The primer still fails at first contact or spread on the substrate<\/td>\n<td>The primer wets but still needs crater control, recoating balance, or calmer laydown<\/td>\n<td>Foam, microbubbles, or pinholes are the real bottleneck<\/td>\n<\/tr>\n<tr>\n<td>Hoofdobservatiepunt<\/td>\n<td>Best treated as a wetting-first route rather than a full defect package<\/td>\n<td>Better when the team needs broader film-settling support, not only stronger wetting<\/td>\n<td>Not recommended as a late after-addition shortcut<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Wanneer WD-D545 de betere eerste keuze is<\/h2>\n<p>WD-D545 should move first when the waterborne primer is still failing at the very beginning of film formation. If the coating does not enter the substrate cleanly, pulls back too early, or cannot spread evenly enough to judge the rest of the package, a <strong>wetting-first route<\/strong> is usually more informative than jumping straight to a broader balancing additive.<\/p>\n<p>That is what makes D545 commercially useful. Longchang supports it with explicit <strong>surface-tension-reduction<\/strong> language and the direct <strong>20.5 mN\/m at 0.2% in water<\/strong> note. The practical buyer value is not just that it belongs to a known wetting family. It is that it gives a clean first benchmark when the waterborne primer still has a clear surface-entry problem.<\/p>\n<p>WD-D545 is usually the better first route when:<\/p>\n<ul>\n<li>the primer is still struggling to wet or spread over the target substrate,<\/li>\n<li>the team needs to learn whether the problem is truly early surface entry before screening broader defect packages,<\/li>\n<li>the project sits in a water-borne industrial, plastic, or wood-primer window, or<\/li>\n<li>the lab wants a route that can still be added later in production without rebuilding the whole process.<\/li>\n<\/ul>\n<p>This is the cleaner first path when the primer is not yet laying down honestly enough to judge other additives.<\/p>\n<h2>Wanneer WD-D547 de betere eerste keuze is<\/h2>\n<p>WD-D547 deserves the earlier screen when the coating team no longer needs only stronger wetting. It becomes the better benchmark when the waterborne primer needs a broader balance of <strong>wetting, anti-cratering, recoating, defoaming, and leveling<\/strong>. That matters in primer programs where the coating can already contact the substrate, but the settled film still looks less even, less calm, or more defect-prone than the buyer wants.<\/p>\n<p>Longchang\u2019s supported evidence makes that distinction useful. D547 is not positioned only as a stronger-wetting route. The product page explicitly ties it to <strong>anti-kratervorming<\/strong>, <strong>re-coating<\/strong>, En <strong>nivellering<\/strong>. That makes it the cleaner first move when the buyer wants a wider primer-screening benchmark rather than only more aggressive surface entry.<\/p>\n<p>WD-D547 is usually the better first route when:<\/p>\n<ul>\n<li>the primer wets the substrate directionally but still shows crater risk or unsettled laydown,<\/li>\n<li>the project expects a second coating stage and wants clearer <strong>recoating behavior<\/strong>,<\/li>\n<li>the team wants one screen that sits between pure wetting and full defect rescue, or<\/li>\n<li>the formulator needs a broader primer route that can still travel across multiple coating-system families later.<\/li>\n<\/ul>\n<p>This is often the more practical first screen when the buyer already knows the substrate can be reached, but not yet finished cleanly.<\/p>\n<h2>When DF-D9904BR is the better first move<\/h2>\n<p>DF-D9904BR should move ahead first when the waterborne primer is losing the fight to <strong>foam, microbubbles, or pinholes<\/strong>. In those cases, better wetting alone may not stabilize the line. The primer can look directionally better during application but still dry with trapped air or film defects that block a fair read on the rest of the system.<\/p>\n<p>Longchang\u2019s product page is unusually direct here. DF-D9904BR is supported specifically to <strong>prevent microbubbles and pinholes in the coating film of water-based coatings and inks<\/strong>. It is also supported with a clear handling discipline: <strong>add under high shear<\/strong>, and do not treat it as a late after-addition shortcut.<\/p>\n<p>DF-D9904BR is usually the better first route when:<\/p>\n<ul>\n<li>the primer already shows persistent foam or microbubble carry-through,<\/li>\n<li>pinhole defects are making it hard to judge whether wetting and leveling are actually acceptable,<\/li>\n<li>the process includes high-shear dispersion and can accommodate the recommended addition method, or<\/li>\n<li>the team needs to clean up process-side air problems before comparing higher-level surface additives.<\/li>\n<\/ul>\n<p>This is the stronger first path when the real bottleneck is not surface entry but trapped air management inside a water-based primer process.<\/p>\n<h2>How buyers should choose before the first sample round<\/h2>\n<h3>1. Start with the first visible failure mode<\/h3>\n<p>If the primer still cannot enter or spread over the substrate cleanly, start with WD-D545. If the coating is touching the surface but settling badly, cratering, or creating a less reliable recoating window, move to WD-D547. If bubbles and pinholes are already dominating the film, start with DF-D9904BR.<\/p>\n<h3>2. Separate application-stage problems from process-stage problems<\/h3>\n<p>Not every bad-looking primer needs a broader wetting agent. Some need a true defoamer route. D545 and D547 are stronger when the buyer is still solving surface behavior. D9904BR is stronger when process-side air management is the actual blocker.<\/p>\n<h3>3. Keep anti-cratering logic and defoamer logic separate<\/h3>\n<p>Teams sometimes collapse crater control and defoaming into the same question. That can blur the first trial. D547 is the cleaner route when the coating needs broader wetting-plus-leveling balance with anti-cratering support. D9904BR is the cleaner route when trapped air and pinhole control dominate the defect pattern.<\/p>\n<h3>4. Respect the addition discipline<\/h3>\n<p>D545 can be incorporated at any stage, including post-addition. D547 can be added directly or after dilution. D9904BR should be handled differently, because Longchang explicitly recommends high-shear incorporation and warns against treating it as a late after-addition fix.<\/p>\n<h3>5. Keep the first sample round small and honest<\/h3>\n<p>For many primer labs, the cleanest first plan is one <strong>D545 wetting-first route<\/strong>, een <strong>D547 broader anti-cratering and recoating route<\/strong>en \u00e9\u00e9n <strong>D9904BR foam-control route<\/strong>. That usually teaches more than forcing several near-neighbor additives into the same starting lane.<\/p>\n<h2>Aanbevolen route naar Longchange vanaf deze pagina<\/h2>\n<ul>\n<li><strong>Wetting-first primer route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/nl\/product\/agesin-wd-d545\/\">CHLUMICRYL\u00ae WD-D545<\/a><\/li>\n<li><strong>Broader primer-surface balance route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/nl\/product\/agesin-wd-d547-wetting-agent\/\">CHLUMICRYL\u00ae WD-D547<\/a><\/li>\n<li><strong>Water-based microbubble-control route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/nl\/product\/agesin-we-d9904br-defoamer\/\">CHLUMICRYL\u00ae DF-D9904BR<\/a><\/li>\n<li><strong>Clusteroverzicht:<\/strong> <a href=\"https:\/\/longchangchemical.com\/nl\/chlumicryl-coating-ink-additives\/\">CHLUMICRYL\u00ae coating- en inktadditieven<\/a><\/li>\n<li><strong>Gerelateerde functiepagina:<\/strong> <a href=\"https:\/\/longchangchemical.com\/nl\/wetting-additives-coatings-inks\/\">Hoe kies je de juiste bevochtigingsmiddelen voor coatings, inkten en lastige ondergronden?<\/a><\/li>\n<li><strong>Gerelateerde functiepagina:<\/strong> <a href=\"https:\/\/longchangchemical.com\/nl\/defoamers-coatings-inks\/\">Hoe kies je de juiste schuimremmers voor coatings en inkten?<\/a><\/li>\n<li><strong>Gerelateerde applicatiepagina:<\/strong> <a href=\"https:\/\/longchangchemical.com\/nl\/waterborne-direct-to-metal-additives\/\">How to Choose Additives for Waterborne Direct-to-Metal Coatings<\/a><\/li>\n<\/ul>\n<h2>FAQ<\/h2>\n<h3>Which additive should I screen first for a waterborne primer that still does not wet the substrate cleanly?<\/h3>\n<p>Usually WD-D545, because Longchang directly supports it around strong surface-tension reduction plus wetting and spreading in water-borne paint systems.<\/p>\n<h3>Wanneer moet WD-D547 WD-D545 voorbijstreven?<\/h3>\n<p>WD-D547 should move ahead when the primer already wets directionally but still needs a broader route for anti-cratering, recoating, defoaming, and leveling balance.<\/p>\n<h3>When does DF-D9904BR make more sense than either wetting additive?<\/h3>\n<p>It makes more sense when foam, microbubbles, or pinholes are the dominant failure mode and the line can follow the recommended high-shear addition method.<\/p>\n<h3>Is this page only for metal primers?<\/h3>\n<p>No. The page is framed for waterborne primers more broadly, while keeping product facts tied to Longchang-supported application windows rather than inventing unsupported substrate claims.<\/p>\n<h2>Een kortere shortlist nodig?<\/h2>\n<p>If your waterborne primer program is stuck between <strong>poor substrate entry<\/strong>, <strong>craters and recoating uncertainty<\/strong>, En <strong>microbubble carry-through<\/strong>, stop treating them as the same first additive problem. Start with the real failure mode. That usually makes the next CHLUMICRYL\u00ae sample decision faster and more commercially useful.<\/p>","protected":false},"excerpt":{"rendered":"<p>A practical CHLUMICRYL\u00ae buyer guide for waterborne primers that separates substrate-entry wetting, broader anti-cratering and recoating balance, and water-based microbubble control.<\/p>","protected":false},"author":6,"featured_media":10793,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10792","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>Waterborne Primer Additives | Wetting, Anti-Cratering, and Microbubble Control<\/title>\n<meta name=\"description\" content=\"Learn how to choose CHLUMICRYL\u00ae additives for 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