{"id":10483,"date":"2026-07-07T00:00:43","date_gmt":"2026-07-07T00:00:43","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10483"},"modified":"2026-07-07T12:09:38","modified_gmt":"2026-07-07T12:09:38","slug":"uv-primer-anti-cratering","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/tr\/uv-primer-anti-cratering\/","title":{"rendered":"How to Choose Additives for UV Primer Anti-Cratering"},"content":{"rendered":"<p><strong>H\u0131zl\u0131 cevap:<\/strong> the best additive for <strong>UV primer cratering<\/strong> depends on <strong>why the crater is forming<\/strong>. If the first problem is poor wetting and spreading, a wetting route such as <a href=\"https:\/\/longchangchemical.com\/tr\/product\/agesin-wd-d547-wetting-agent\/\">CHLUMICRYL\u00ae WD-D547<\/a> deserves earlier review. If the system is a <strong>solvent-based UV primer<\/strong> with persistent crater pressure, anti-shrinkage stress, or a <strong>silicone-restricted<\/strong> formulation window, <a href=\"https:\/\/longchangchemical.com\/tr\/product\/agesinfs-d9013r\/\">CHLUMICRYL\u00ae FS-D9013R<\/a> usually moves up first. If the buyer still needs strong crater control but the process is closer to <strong>large-area spraying<\/strong> or <strong>varnish-compatible UV work<\/strong>, <a href=\"https:\/\/longchangchemical.com\/tr\/product\/agesinfs-d8950br\/\">CHLUMICRYL\u00ae FS-D8950BR<\/a> becomes a stronger first route. If the panel is showing more <strong>orange peel and spray-flow instability<\/strong> than hard crater pressure, <a href=\"https:\/\/longchangchemical.com\/tr\/product\/agesin-fs-d8980\/\">CHLUMICRYL\u00ae FS-D8980<\/a> is often the cleaner comparison point.<\/p>\n<p>This page is narrower than the broader <a href=\"https:\/\/longchangchemical.com\/tr\/uv-coating-flow-leveling\/\">UV coating flow and leveling<\/a> guide and the wider <a href=\"https:\/\/longchangchemical.com\/tr\/fluorine-surfactants-surface-control\/\">fluorine surfactant<\/a> page. It is built for buyers who already know the pain point sits in <strong>UV primer anti-cratering<\/strong> and now need a faster first-screen logic.<\/p>\n<h2>Why UV primer cratering needs its own selection logic<\/h2>\n<p>UV primer work is rarely judged by surface appearance alone. The primer still has to wet the substrate, stay stable during application, control crater formation, and often remain friendly to <strong>recoating<\/strong> or downstream topcoat work. That means a crater in UV primer is not always just a generic surface-defect problem.<\/p>\n<p>In practice, buyers usually need to separate four different first questions:<\/p>\n<ul>\n<li><strong>Is the real issue wetting and spread?<\/strong><\/li>\n<li><strong>Is the crater pressure strong enough to require a fluorocarbon rescue route?<\/strong><\/li>\n<li><strong>Is the production method closer to spray-applied UV work where large-area application behavior matters?<\/strong><\/li>\n<li><strong>Will the primer still need clean recoating afterward?<\/strong><\/li>\n<\/ul>\n<p>That split is commercially useful because Longchang\u2019s current CHLUMICRYL\u00ae pages already support different answers for those different first problems.<\/p>\n<h2>When to start with wetting, and when to move to a crater-control route<\/h2>\n<table>\n<thead>\n<tr>\n<th>Observed UV primer problem<\/th>\n<th>Best first route<\/th>\n<th>Why<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Poor spread, weak coverage, or unstable wetting before the crater pattern fully develops<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/tr\/product\/agesin-wd-d547-wetting-agent\/\">WD-D547<\/a><\/td>\n<td>The first failure is still how the primer reaches and covers the surface<\/td>\n<\/tr>\n<tr>\n<td>Persistent cratering or anti-shrinkage pressure in solvent-based UV primer, especially with silicone restrictions<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/tr\/product\/agesinfs-d9013r\/\">FS-D9013R<\/a><\/td>\n<td>Longchang directly supports it for strong anti-cratering and silicone-restricted UV primer logic<\/td>\n<\/tr>\n<tr>\n<td>Crater control plus varnish compatibility and large-area spraying matter together<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/tr\/product\/agesinfs-d8950br\/\">FS-D8950BR<\/a><\/td>\n<td>The supported fit is solvent-based UV cure with anti-cratering, varnish compatibility, and large-area spray relevance<\/td>\n<\/tr>\n<tr>\n<td>Orange peel and spray-flow uniformity matter more than the strongest crater-rescue route<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/tr\/product\/agesin-fs-d8980\/\">FS-D8980<\/a><\/td>\n<td>The supported positioning is good long-wave leveling and orange-peel prevention in solvent-based UV cure<\/td>\n<\/tr>\n<tr>\n<td>Visible air or foam behavior is the real root cause<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/tr\/defoamers-coatings-inks\/\">Defoamer route<\/a><\/td>\n<td>Do not ask a surface-control additive to solve a true air-management problem<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>CHLUMICRYL\u00ae routes to review first for UV primer anti-cratering<\/h2>\n<h3>1. WD-D547 when the crater starts as a wetting and spreading failure<\/h3>\n<p><a href=\"https:\/\/longchangchemical.com\/tr\/product\/agesin-wd-d547-wetting-agent\/\">CHLUMICRYL\u00ae WD-D547<\/a> is supported by Longchang for <strong>water-borne paint, solvent and solvent-free paint, and UV cure paint<\/strong>. The product page states that it <strong>most effectively reduces the surface tension in water systems<\/strong> and provides <strong>excellent wetting and spreading<\/strong> together with <strong>anti-cratering, re-coating, defoaming, and leveling<\/strong>. The suggested addition range is <strong>0,1% ila 0,5%<\/strong>.<\/p>\n<p>That makes WD-D547 a practical first route when the UV primer is not yet laying down correctly enough for a narrower fluorocarbon route to be the first move. It deserves earlier review when:<\/p>\n<ul>\n<li>the primer still shows <strong>coverage and spread instability<\/strong>,<\/li>\n<li>the crater pattern looks tied to <strong>wetting failure<\/strong> rather than only to stronger surface-tension mismatch,<\/li>\n<li>the project still needs a route that keeps <strong>recoating<\/strong> visible, and<\/li>\n<li>the team wants a broader first correction before moving to a more specialized fluorine lane.<\/li>\n<\/ul>\n<h3>2. FS-D9013R when solvent-based UV primer needs a stronger anti-cratering answer<\/h3>\n<p><a href=\"https:\/\/longchangchemical.com\/tr\/product\/agesinfs-d9013r\/\">CHLUMICRYL\u00ae FS-D9013R<\/a> is one of the clearest supported routes for this page. Longchang positions it for <strong>solvent-based UV cure<\/strong> and supports it with <strong>good long-wave leveling<\/strong>, <strong>orange-peel prevention<\/strong>, <strong>excellent anti-cratering ability<\/strong>, <strong>fast leveling speed<\/strong>, ve <strong>high-temperature resistance<\/strong>. The product page also says it <strong>could recoating<\/strong> and is often used as an <strong>anti-shrinkage additive in systems where silicone additives cannot be used<\/strong>. Longchang further notes that it gives an excellent anti-cratering effect in <strong>common UV primer<\/strong> without affecting recoating, while also warning that it is <strong>not applicable in UV vacuum electroplating primer<\/strong> because it will affect recoating. The suggested addition range is <strong>0.1% to 1.0%<\/strong>.<\/p>\n<p>That makes FS-D9013R the stronger first route when:<\/p>\n<ul>\n<li>the formulation is clearly a <strong>solvent-based UV primer<\/strong>,<\/li>\n<li>the crater problem remains after more ordinary wetting or leveling changes,<\/li>\n<li><strong>silicone restriction<\/strong> matters in the project window, or<\/li>\n<li>the team needs a supported route for <strong>common UV primer<\/strong> work that still respects recoating, but not UV vacuum electroplating primer.<\/li>\n<\/ul>\n<h3>3. FS-D8950BR when anti-cratering, varnish compatibility, and spray application matter together<\/h3>\n<p><a href=\"https:\/\/longchangchemical.com\/tr\/product\/agesinfs-d8950br\/\">CHLUMICRYL\u00ae FS-D8950BR<\/a> is also supported for <strong>solvent-based UV cure<\/strong>, but with a slightly different commercial logic. Longchang supports it with <strong>good compatibility in varnish<\/strong>, <strong>good long-wave leveling<\/strong>, <strong>orange-peel prevention<\/strong>, ve <strong>excellent anti-cratering ability<\/strong>. The same page also states that it is <strong>suitable for large-area spraying<\/strong>, has <strong>no foam inhibition<\/strong>, and can help prevent color channeling between colors after <strong>wet spraying and drying<\/strong>. The suggested addition range is <strong>0.1% to 1.0%<\/strong>.<\/p>\n<p>That pushes FS-D8950BR forward when:<\/p>\n<ul>\n<li>the UV primer or related UV underlayer is being applied in a <strong>spray-oriented process<\/strong>,<\/li>\n<li>the buyer still needs strong <strong>crater control<\/strong>,<\/li>\n<li><strong>varnish compatibility<\/strong> matters in the surrounding formulation logic, and<\/li>\n<li>the team wants a supported fluorocarbon route that fits <strong>large-area spraying<\/strong> more directly.<\/li>\n<\/ul>\n<p>The watchpoint is useful too. Longchang explicitly says the product has <strong>no foam inhibition<\/strong>, so it should not be used as a substitute for a true defoamer when the real defect starts with trapped air.<\/p>\n<h3>4. FS-D8980 when the bigger issue is orange peel and spray-flow behavior<\/h3>\n<p><a href=\"https:\/\/longchangchemical.com\/tr\/product\/agesin-fs-d8980\/\">CHLUMICRYL\u00ae FS-D8980<\/a> is another solvent-based UV cure fluorocarbon route, but its supported role is a little cleaner when the problem is more about <strong>leveling and orange-peel prevention<\/strong> than about the strongest crater rescue. Longchang supports it with <strong>good compatibility in varnish<\/strong>, <strong>good long-wave leveling<\/strong>, <strong>orange-peel prevention<\/strong>, suitability for <strong>large-area spraying<\/strong>, and prevention of color channeling between colors after <strong>wet spraying and drying<\/strong>. The suggested addition range is <strong>0.05% to 0.8%<\/strong>.<\/p>\n<p>FS-D8980 belongs earlier when:<\/p>\n<ul>\n<li>the UV primer panel is showing <strong>spray-flow inconsistency<\/strong> ve <strong>orange peel<\/strong>,<\/li>\n<li>the crater pressure is present but not clearly as dominant as in a 9013R-led route,<\/li>\n<li>the buyer still wants a <strong>varnish-compatible<\/strong> fluorocarbon path, and<\/li>\n<li>the team wants a lower-dose comparison route before escalating.<\/li>\n<\/ul>\n<h2>How buyers should narrow the first sample round<\/h2>\n<h3>Start with the defect stage<\/h3>\n<p>If the primer is still failing at the <strong>wetting and spreading stage<\/strong>, begin with WD-D547. If the film already wets but still forms stubborn craters, move into the fluorocarbon route sooner.<\/p>\n<h3>Keep recoating visible from the beginning<\/h3>\n<p>UV primer work is not only about the first panel looking better. The primer still has to fit the next layer. That is why Longchang\u2019s recoating note on FS-D9013R matters so much.<\/p>\n<h3>Separate crater rescue from spray optimization<\/h3>\n<p>FS-D9013R is stronger when the discussion is about <strong>hard crater pressure<\/strong> and silicone-restricted primer logic. FS-D8950BR and FS-D8980 become more attractive when the process is closer to <strong>spray application<\/strong>, <strong>varnish compatibility<\/strong>, ve <strong>orange-peel management<\/strong>.<\/p>\n<h3>Do not confuse air-management defects with surface-control defects<\/h3>\n<p>Once Longchang tells you that FS-D8950BR and FS-D8980 have <strong>no foam inhibition<\/strong>, that is a useful warning. If the defect is really coming from foam or trapped air, move that sample round back toward a defoamer path instead of asking the fluorocarbon route to solve the wrong problem.<\/p>\n<h3>Keep the first screen short<\/h3>\n<p>For most buyers, the cleanest first screen is one <strong>wetting-led route<\/strong>, one <strong>crater-heavy fluorocarbon route<\/strong>, and one <strong>spray-flow fluorocarbon route<\/strong>. That usually teaches more than testing too many overlapping additives at once.<\/p>\n<h2>Recommended Longchang path from this page<\/h2>\n<ul>\n<li><strong>Overview page:<\/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 function page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/wetting-additives-coatings-inks\/\">How to Choose Wetting Additives for Coatings and Inks<\/a><\/li>\n<li><strong>Related function page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/fluorine-surfactants-surface-control\/\">How to Choose Fluorine Surfactants for Surface Control in Coatings and Inks<\/a><\/li>\n<li><strong>Related application page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/uv-coating-flow-leveling\/\">How to Improve Flow and Leveling in UV Coatings<\/a><\/li>\n<li><strong>Related application page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/uv-varnish-surface-control\/\">Surface Control Additives for UV Varnishes and Overprint Systems<\/a><\/li>\n<li><strong>Related comparison page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/9013r-vs-8950br-vs-8980\/\">FS-D9013R vs FS-D8950BR vs FS-D8980<\/a><\/li>\n<\/ul>\n<h2>SSS<\/h2>\n<h3>What is the best first additive when a UV primer still does not spread correctly?<\/h3>\n<p>Start with WD-D547 earlier because Longchang directly supports it with wetting, spreading, anti-cratering, recoating, defoaming, and leveling across water-borne, solvent, solvent-free, and UV cure paint systems.<\/p>\n<h3>When should FS-D9013R move ahead of FS-D8950BR?<\/h3>\n<p>FS-D9013R should move ahead when the project is a solvent-based UV primer with stronger crater pressure, anti-shrinkage needs, or silicone restrictions, especially when common UV primer recoating still matters.<\/p>\n<h3>Why would a buyer start with FS-D8950BR instead of FS-D8980?<\/h3>\n<p>Start with FS-D8950BR when anti-cratering remains a stronger priority and the process also depends on varnish compatibility or large-area spraying. FS-D8980 is the cleaner first route when leveling and orange-peel control are more dominant than hard crater rescue.<\/p>\n<h3>Can FS-D9013R be used in every UV primer?<\/h3>\n<p>No. Longchang explicitly warns that FS-D9013R is not applicable in UV vacuum electroplating primer because it will affect recoating, even though it is supported for common UV primer anti-cratering work.<\/p>\n<h2>Need a faster first shortlist for UV primer cratering?<\/h2>\n<p>If your UV primer line is losing time to crater defects, stop treating every crater as the same problem. First decide whether the failure is <strong>wetting-led<\/strong>, <strong>crater-heavy and silicone-restricted<\/strong>, or <strong>spray-flow and orange-peel led<\/strong>. That usually leads to the right CHLUMICRYL\u00ae route much faster than testing all surface-control additives as if they solved the same first job.<\/p>","protected":false},"excerpt":{"rendered":"<p>Learn how to solve UV primer cratering by separating wetting failure, persistent anti-cratering pressure, spray-process needs, and recoating limits across supported CHLUMICRYL\u00ae additive routes.<\/p>","protected":false},"author":6,"featured_media":10484,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10483","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>UV Primer Anti-Cratering: How to Choose the Right Additive Route<\/title>\n<meta name=\"description\" content=\"Learn 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