빠른 답변: buyers should not start with a random additive family when a coating or ink panel fails. The first useful question is what failed first. If the liquid does not spread or cover the substrate cleanly, start with a wetting additive. If the film reaches the substrate but still looks rough, patchy, or weak in gloss, start with a leveling additive. If the real defect is trapped foam, microbubbles, or poor air release, move earlier to a defoamer. If ordinary wetting or leveling changes still leave persistent craters, orange peel, or stronger anti-shrinkage pressure in UV systems, a fluorine-surfactant route belongs earlier.
That is the commercially useful split. This page is for buyers who are tired of running broad additive screens when the real issue could have been narrowed much faster by defect type.
Why buyers confuse these additive families so often
In coatings and inks, several surface defects can show up on the same panel at the same time. A poor film may bead on the substrate, trap foam during mixing, and still look rough after cure. That is exactly why teams often over-test. The defect gets described as a general “surface problem,” then wetting agents, leveling agents, defoamers, and fluorine routes all get thrown into the same first trial.
A better approach is to separate the first failure mode:
- Poor wetting: the liquid does not spread or cover the surface correctly.
- Poor leveling: the liquid gets onto the substrate, but the final film still looks uneven.
- Foam or microbubbles: entrained air is creating visible or hidden defects.
- Persistent crater or orange-peel pressure: the panel still defects after more ordinary surface adjustments.
That is where the current Longchang CHLUMICRYL-supported routes become useful, because the product pages already separate these decision paths clearly enough for a practical first shortlist.
Quick comparison table: which additive family deserves the first screen?
| Observed first problem | Best first route | Why it belongs first | Useful Longchang anchor |
|---|---|---|---|
| Beading, edge pullback, unstable coverage, or poor spread on the substrate | Wetting additive | The bottleneck is substrate coverage and surface-tension control | WD-D547 |
| Film covers but still shows rough laydown, uneven gloss, or weak flow-out | Leveling additive | The bottleneck is final-film appearance rather than initial spread | LA-D559 |
| Foam, microbubbles, pinhole risk, or poor air release dominate | 소포제 | The root issue is air management, not only surface appearance | DF-D9202 |
| Ordinary wetting or leveling fixes still leave craters, orange peel, shrinkage, or a silicone-restricted UV problem | 불소 계면활성제 | The system needs a narrower, stronger surface-control route | FS-D9013R |
When a wetting additive is the better first move
A wetting additive should move to the front when the coating or ink is failing at the surface-entry stage. That means the liquid is not getting where it needs to go in a clean, stable way.
CHLUMICRYL® WD-D547 is a strong anchor example because Longchang supports it for water-borne paint, solvent and solvent-free paint, and UV-cure paint. The product page says it can most effectively reduce surface tension in water systems and offers wetting, spreading, anti-cratering, re-coating, defoaming, and leveling performance, with a suggested addition range of 0.1% ~ 0.5%.
That makes wetting the cleaner first choice when:
- the coating beads up or retreats instead of covering the substrate cleanly
- edge pullback or difficult-surface coverage is the first visible failure
- the team is still trying to stabilize spread before worrying about premium appearance
- the panel does not yet justify jumping to a more specialized fluorine route
If the liquid never really gets onto the surface correctly, moving directly to a leveling additive or a fluorine surfactant can create noise instead of clarity.
When a leveling additive is the better first move
A leveling additive becomes the better screen when the liquid already reaches the substrate, but the film still does not settle into a commercially acceptable surface.
클로미크릴® LA-D559 is supported by Longchang as a polyether modified polydimethylsiloxane with OH functional group for UV cure. The product page states that it increases leveling, wetting, and gloss for paints and ink, with a suggested addition range of 0.05% to 0.5%.
That pushes leveling forward when:
- coverage is acceptable, but the cured film still shows rough flow-out or uneven gloss
- the buyer is chasing a cleaner decorative or premium-looking finish
- surface smoothness matters more than initial substrate-entry problems
- the issue is how the film settles, not whether it spreads in the first place
This is the point where many buyers accidentally keep changing wetting additives even though the panel has already moved into a final-appearance problem.
When a defoamer is the better first move
A defoamer belongs first when the real problem is entrained air. If the film is carrying foam, fine bubbles, or poor air-release behavior through mixing, pumping, coating, or cure, wetting and leveling changes may not solve the root cause fast enough.
CHLUMICRYL® DF-D9202 is a useful anchor because Longchang supports it for UV 경화 시스템 and highlights excellent foam inhibition, excellent defoaming, strong defoaming performance in roller coating construction, and strong performance in UV matte paint. Longchang also notes that in glossy UV systems paint compatibility should be evaluated, and gives a suggested addition range of 0.1% to 1.0%.
That makes a defoamer the cleaner first route when:
- the panel shows foam, trapped bubbles, or pinhole-style air-release defects
- the application method keeps introducing air into the system
- UV matte or roller-coating conditions are amplifying the defect pattern
- the surface problem looks secondary to the air-management problem
If the formulation is still carrying air, pushing harder on leveling alone can leave the team solving the wrong problem.
When a fluorine surfactant is the better first move
A fluorine surfactant becomes the better screen when the panel is still failing after more ordinary surface moves, especially in UV systems where persistent craters, orange peel, anti-shrinkage pressure, or silicone restrictions are shaping the decision.
클로미크릴® FS-D9013R is a useful anchor because Longchang supports it as a fluorocarbon copolymer solution for solvent-based UV cure. The product page says it provides good long-wave leveling, helps prevent orange peel, gives excellent anti-cratering, offers fast leveling speed, and supports recoating. Longchang also explicitly says it is often used as an anti-shrinkage additive where silicone additives cannot be used. The suggested addition range is 0.1% to 1.0%.
Just as important, Longchang includes a practical limitation: FS-D9013R is useful in common UV primer anti-cratering work without affecting recoating, but it should not be used in UV vacuum electroplating primer because it will affect recoating.
This pushes fluorine-surfactant logic earlier when:
- ordinary wetting or leveling changes are still not enough
- the UV system keeps showing crater or orange-peel pressure
- the buyer needs a stronger surface-control route in a silicone-restricted window
- recoating still matters and the project is within the supported application fit
How buyers should narrow the first sample round
1. Name the defect before naming the chemistry
“Surface problem” is too broad. Force the team to call out the first visible failure: spread, laydown, foam, or persistent crater pressure.
2. Do not let multifunctional claims hide the primary job
WD-D547 also touches anti-cratering and leveling. LA-D559 also mentions wetting. DF-D9202 also has slip. FS-D9013R also levels quickly. That does not make them interchangeable. The first screen should still follow the main defect.
3. Keep system fit visible
LA-D559 is positioned for UV cure. DF-D9202 is built around UV curing systems and especially UV matte and roller-coating conditions. FS-D9013R sits in solvent-based UV cure. If the system boundary is wrong, the panel read becomes muddy quickly.
4. Escalate to the narrower route only when the ordinary route is not enough
Many teams should still start with wetting or leveling before moving to a fluorine route, unless the defect pattern clearly says otherwise.
5. Protect recoating and downstream process reality
Particularly in UV work, a panel that looks better is not automatically a commercial win if it breaks recoating or downstream conversion. Longchang’s note on FS-D9013R is a good reminder.
Recommended Longchang path from this page
- Wetting decision page: How to Choose Wetting Additives for Coatings, Inks, and Difficult Substrates
- Leveling decision page: How to Choose Leveling Additives for Coatings and Inks
- Defoamer decision page: How to Choose Defoamers for Coatings and Inks
- Fluorine-surfactant decision page: How to Choose Fluorine Surfactants for Surface Control in Coatings and Inks
- Cluster overview: 클로미크릴® 코팅 및 잉크 첨가제
자주 묻는 질문
Should I start with a wetting additive or a leveling additive?
Start with wetting when the liquid still fails to spread or cover the surface. Start with leveling when coverage is already acceptable but the film still looks rough, uneven, or weak in gloss.
When does a defoamer matter more than a leveling additive?
A defoamer matters more when trapped air, foam, microbubbles, or weak air release are driving the defect pattern. If air is the main problem, leveling changes alone may not solve the root cause.
Why not jump straight to a fluorine surfactant?
Because many surface problems are still ordinary wetting, leveling, or air-management problems. A fluorine route becomes more useful when the panel keeps showing persistent crater, orange-peel, or silicone-restricted UV pressure after more standard routes are considered.
Can one additive solve all four problems?
No. Some products are multifunctional, but buyers still need to match the first screen to the dominant failure mode. That usually gives a cleaner commercial answer than asking one chemistry family to fix everything at once.
Need a faster first shortlist?
If your coating or ink team is stuck between wetting, leveling, defoaming, and fluorine-surface-control options, stop asking which additive sounds strongest on paper. Start by naming the first defect that appears on the panel. That usually tells you which Longchang route deserves the first sample round.