Snel antwoord: if your waterborne epoxy basecoat still looks unstable before the next layer, the first job is to separate substrate-entry wetting and anti-cratering, broader basecoat leveling, En water-based bubble cleanup instead of calling everything a generic flow problem. If the epoxy basecoat still hesitates, pulls back, or shows crater pressure early in film formation, start earlier with CHLUMICRYL® WD-D547. If the film already reaches the surface but still needs calmer, smoother laydown across the middle epoxy layer, move CHLUMILE® 3345 higher in the first screen. If the real blocker is microbubbles or pinholes in a water-based epoxy basecoat before topcoat, use CHLUMICRYL® DF-D9904BR as the cleaner first route.
This page is intentionally narrower than the already-live stage pages for waterborne epoxy primers en waterborne epoxy topcoats. It answers a tighter B2B buyer question: for epoxy systems that still use a distinct basecoat stage, which additive route should you screen first? That keeps the page in the CHLUMICRYL® coating-and-ink-additives direction instead of drifting back into the older photoinitiator cluster.
Why a waterborne epoxy basecoat needs its own page
A waterborne epoxy basecoat sits in a tighter decision lane than a broad waterborne-coating page. The primer discussion is earlier and more substrate-entry focused. The topcoat discussion is later and more exposed-finish focused. The basecoat stage sits in between. It still has to wet and spread cleanly, but it also has to build a calmer middle film before the next layer locks in the result.
That gives buyers a different first-screen problem. In practical formulation work, a waterborne epoxy basecoat often needs the lab to separate a wetting and crater-sensitive entry problem from a broader middle-layer leveling problem, and both from a true water-based microbubble and pinhole problem. Those are not the same first screen, even if one drawdown shows all three symptoms at once.
The general industry framing here stays conservative. Waterborne epoxy systems are commonly judged for substrate coverage, cleaner film formation, and control of trapped air before the next layer goes on. This page uses that outside framing only lightly while keeping product-level claims anchored to Longchang-supported product pages.
What these three additive routes do differently
- CHLUMICRYL® WD-D547 is supported by Longchang as a polyether-modified polydimethylsiloxane route for water-borne, solvent-based, solvent-free, and UV-curing paint systems. The current company-supported buyer language includes bevochtiging, spreading, anti-kratervorming, recoating, ontschuimend, En nivellering, with a typical recommended dosage of 0,1% tot 0,5%. For a waterborne epoxy basecoat, that makes it the cleaner first route when the film still struggles at the substrate interface or breaks during early film formation.
- CHLUMILE® 3345 is the stronger supported route when the epoxy basecoat already reaches the surface but still needs broader wetting-and-leveling cleanup. Longchang positions it directly as a wetting and leveling agent, with a typical dosage of 0,1% tot 1,0%, flexible addition during grinding, stirring, or after production, and the note that co-solvents such as dipropylene glycol methyl ether can enhance the effect. That makes it commercially useful once first-contact failure is no longer the main bottleneck.
- CHLUMICRYL® DF-D9904BR is Longchang’s water-based defoamer route for microbubble and pinhole cleanup in water-based coatings and inks. The current company-supported positioning keeps it around uitsluitend systemen op waterbasis, a typical dosage of 0,1% tot 1,0%, and a process rule that it should be introduced through a co-solvent step under high shear. In a waterborne epoxy basecoat, it becomes the cleaner first route when the main defect is trapped air, not surface entry or ordinary leveling.
Snelle vergelijkingstabel: welke route verdient de eerste plek op het scherm?
| Observed basecoat problem | Beste eerste route | Waarom het op de eerste plaats hoort | Hoofdobservatiepunt |
|---|---|---|---|
| Basecoat hesitates on the substrate, pulls back, or still shows crater pressure early in film formation | CHLUMICRYL® WD-D547 | Supported for wetting, spreading, anti-cratering, recoating, and leveling across water-borne paint systems | Use it when entry behavior is still the real blocker, not when trapped air is the main defect |
| Basecoat already reaches the surface but the middle layer still looks uneven, unsettled, or visually rough before the next coat | CHLUMILE® 3345 | Cleaner route for broader wetting-and-leveling cleanup after first contact is directionally working | Do not force it to solve a defect that is really crater-led or bubble-led |
| Water-based basecoat traps microbubbles or leaves pinholes that will print through the next layer | CHLUMICRYL® DF-D9904BR | Water-based bubble cleanup is the actual buyer job, not just ordinary flow improvement | If the panel also shows poor surface entry or crater breakup, screen wetting first before blaming all defects on foam |
When WD-D547 is the better first fit
Start with WD-D547 earlier when the epoxy basecoat still behaves like a substrate-interface problem. That usually means the coating does not enter the prepared surface cleanly, crater pressure shows up quickly, or the basecoat still pulls back before the team can honestly judge the rest of the package.
That matters because a basecoat stage is not there only to exist between primer and topcoat. It has to create a stable middle film. If the coating still is not wetting and spreading reliably, later leveling or bubble-cleanup decisions get harder to read.
- Best first-screen use: substrate-entry wetting, spreading, anti-cratering, and recoating-aware correction
- Supported dosage: 0,1% tot 0,5%
- Belangrijkste sterkte: one route that already bundles wetting, crater control, and broader film-settling support
- Main caution: use it when the problem still starts at first contact, not when the real defect is already trapped-air carry-through
In short, WD-D547 is the cleaner first answer when the waterborne epoxy basecoat still needs a more stable entry and early-film benchmark.
When CHLUMILE® 3345 is the better first fit
Move 3345 higher when the basecoat already reaches the surface directionally well enough, but the middle epoxy film still needs a calmer visual read before the next layer. This is the cleaner route when the project is no longer fighting the first-contact problem, but still does not like how the basecoat settles, flows out, or levels before topcoat.
That distinction matters because many basecoat projects are not blocked by total wetting failure. They are blocked by a film that technically reaches the panel but still looks too rough, too unsettled, or too uneven to support a clean next coating step. Longchang’s supported evidence is useful here because 3345 is not framed as a vague surfactant. It is positioned directly as a wetting and leveling agent with a practical process window and explicit co-solvent support.
- Best first-screen use: broader wetting-and-leveling cleanup once the basecoat already reaches the surface
- Supported dosage: 0,1% tot 1,0%
- Belangrijkste sterkte: cleaner middle-layer laydown benchmark before the next epoxy stage
- Main caution: do not use it as a substitute for true crater rescue or bubble cleanup when those are still the real blockers
3345 is often the better first move when the buyer has moved past the question of can this basecoat wet? and into the question of can this basecoat settle more cleanly?
When DF-D9904BR is the better first fit
Move DF-D9904BR earlier when the waterborne epoxy basecoat is losing the fight to microbubbles, foam carry-through, or pinholes. In those cases, another wetting-and-leveling screen can waste time because the real defect is not simply surface behavior. It is trapped air inside the water-based film.
Longchang’s product page is direct here. DF-D9904BR is supported specifically to prevent microbubbles and pinholes in the coating film of water-based coatings and inks. The process note matters too: it should be handled through a co-solvent route under high shear, not treated as a casual late after-add shortcut.
- Best first-screen use: persistent microbubbles and pinholes in waterborne epoxy basecoats
- Supported dosage: 0,1% tot 1,0%
- Belangrijkste sterkte: solves a different first problem from wetting or broader leveling routes
- Main caution: if poor substrate entry is still visible, do not skip the wetting screen just because the film also looks aerated
This is the stronger first route when the real commercial risk is that trapped air will still print through the next layer even after the basecoat seems directionally acceptable.
Hoe kopers een keuze moeten maken voordat ze monsters aanvragen.
1. Start with the first failure in the basecoat
If the film still hesitates or pulls back, start with WD-D547. If it already reaches the surface but still needs calmer laydown, move 3345 earlier. If the basecoat mainly is losing to microbubbles or pinholes, start with DF-D9904BR.
2. Keep primer and topcoat logic from blurring the basecoat job
A primer-style screen can overemphasize early surface entry. A topcoat-style screen can overemphasize final exposed appearance. A basecoat stage needs a tighter middle-layer decision, which is why this page exists at all.
3. Keep bubble cleanup separate from broader leveling
A film that looks rough because it is unsettled and a film that looks rough because it is aerated are not the same additive problem. Separating those routes early usually makes the first lab round cleaner.
4. Respect the process watchpoints
WD-D547 is strongest when first-contact behavior still needs help. 3345 becomes more useful once the film already reaches the surface. DF-D9904BR needs the supported co-solvent and high-shear route. Those details are part of the selection logic, not small process footnotes.
5. Keep the first sample round short
For many waterborne epoxy basecoat projects, one entry-and-crater route, een broader middle-layer leveling routeen één bubble-cleanup route teach more than screening too many partly overlapping additives at once.
Aanbevolen route naar Longchange vanaf deze pagina
- Clusteroverzicht: CHLUMICRYL® coating- en inktadditieven
- Earlier stage: How to Choose Additives for Waterborne Epoxy Primers
- Later stage: How to Choose Additives for Waterborne Epoxy Topcoats
- Gerelateerde functiepagina: Hoe kies je de juiste bevochtigingsmiddelen voor coatings en inkten?
- Gerelateerde defectpagina: How to Choose Additives for Coating Fisheyes
- Gerelateerde defectpagina: How to Choose Additives for Coating Pinholes
- Substrate-entry route: CHLUMICRYL® WD-D547
- Broader basecoat leveling route: CHLUMILE® 3345
- Water-based bubble-cleanup route: CHLUMICRYL® DF-D9904BR
FAQ
Is a waterborne epoxy basecoat page worth creating if some epoxy systems do not use a separate basecoat stage?
Yes, as long as the page is framed narrowly for buyers who do run a distinct basecoat step. That keeps the page commercially honest and avoids pretending every epoxy build follows the same layer stack.
What should I test first if the epoxy basecoat still pulls back or craters early?
Usually WD-D547, because that symptom still belongs in the substrate-entry wetting and anti-cratering lane.
What should I test first if the basecoat already wets but still looks rough before topcoat?
Usually 3345, because the main problem has shifted from first contact to broader wetting-and-leveling cleanup in the middle layer.
What if the basecoat looks aerated or leaves pinholes?
Move DF-D9904BR earlier, because trapped air can survive into the next layer and spoil the appearance even when the wetting route is directionally acceptable.
Are these three additives interchangeable?
No. One is the substrate-entry route, one is the broader middle-layer leveling route, and one is the water-based bubble-cleanup route. They answer different first problems.
Need a faster shortlist for waterborne epoxy basecoats?
If your waterborne epoxy project uses a separate basecoat layer, start by deciding whether the failure is about surface entry, middle-layer laydown, of trapped air. That usually gives a much cleaner first shortlist and a much faster CHLUMICRYL® screen.