Jawaban singkat: pembeli sedang mengerjakan 2K polyurethane sealers usually get a cleaner first shortlist when they separate three different additive jobs instead of asking one silicone route to solve every pre-basecoat problem at once. CHLUMIWE® 3071 should move first when the sealer still needs surface-entry wetting, spread, and penetration before the team can even judge the sealed film honestly. CHLUMIAG® 3467 deserves earlier review when the sealer is still compatibility-sensitive and the main pressure sits around anti-cratering, pullback control, and broader leveling stability. CHLUMIFE® 3370 belongs earlier when the project already is in a true 2K polyurethane route and the sealer needs a more reactive leveling and smooth sealed-surface path before basecoat.
That is the commercially useful split. This page stays inside the redirected CHLUMICRYL® coating-and-ink-additives direction and does not drift back to the older photoinitiator cluster. It also is intentionally narrower than Longchang’s already-live 2K polyurethane primer, 2K polyurethane basecoat, 2K polyurethane topcoat, Dan 2K polyurethane clearcoat pages. A sealer sits in a different buyer window. The question here is not film build like a primer or final appearance like a topcoat. The question is which additive route deserves the first sample round when the sealed surface before basecoat still is not behaving correctly.
Why 2K polyurethane sealers deserve their own additive page
A 2K PU sealer usually sits between earlier surface preparation and the coming basecoat. In practical coating workflows, buyers often use the sealer step to create a more uniform, more predictable surface before color or the next appearance-setting layer goes on top. That makes the first additive question more specific than a broad primer page and different from a basecoat page.
In real formulation work, a sealer program often gets judged on whether the film can wet the prepared surface cleanly, whether it stays stable instead of cratering or pulling back, and whether it leaves a smoother, more even sealed surface so the next basecoat step starts from a calmer foundation. General industry framing supports that split. Sealer-stage discussions commonly focus on surface normalization, more even response before basecoat, and a cleaner bridge between earlier substrate preparation and later color or finish layers. That outside framing is used here only conservatively. The product-specific facts below stay tied to current Longchang-supported product pages.
What the current company-supported evidence already separates
- CHLUMIWE® 3071 is supported by Longchang as a polisiloksan yang dimodifikasi polieter dengan low viscosity dan low surface tension, giving excellent spreadability, wetting, and penetration. The current company page also supports broader usefulness around flow, leveling, recoatability, and gloss retention. Supported dosage is 0,1% hingga 1,0%, and the page notes that the product may have a foam-stabilizing effect on water-based systems.
- CHLUMIAG® 3467 is supported by Longchang as a polisiloksan termodifikasi multi-komponen dan sebuah reactive leveling route that can be used across UV, pelarut, Dan sistem berbasis air. The current company-supported route keeps together penyamarataan, anti-kawah, pembasahan substrat, and a clear note that it prioritizes system compatibility. Supported dosage is 0,05% hingga 1,0% of total formulation for solvent systems, 0,5% hingga 5% of resin amount for resin modification, and 0,5% hingga 5% of total formulation for water-based systems.
- CHLUMIFE® 3370 is supported by Longchang as a reactive hydroxyl polyester-modified polysiloxane. The current company page says it reacts with isocyanate, is suitable for two-component polyurethane crosslinking systems, and improves surface leveling, kilap, Dan kelancaran. Supported dosage is 0.05% to 3% of total formulation, and the product page keeps it in Sistem UV dan pelarut, not water-based systems.
That is enough company-supported separation to build a real buyer page. The goal is not to invent a magical sealer-only additive. The goal is to help a buyer choose the first better screening path based on what the sealer layer is actually failing to do before basecoat.
Tabel perbandingan singkat: rute mana yang layak ditampilkan di layar pertama?
| Observed 2K PU sealer situation | Rute pertama terbaik | Mengapa ini harus didahulukan? | Titik pengawasan utama |
|---|---|---|---|
| The sealer still struggles with surface entry, spread, or uniform first-contact laydown on the prepared surface | CHLUMIWE® 3071 | Longchang supports it directly around low surface tension, spreadability, wetting, penetration, and broader flow support | Water-based systems still need to watch for possible foam stabilization |
| The sealer reaches the surface but still shows crater, fisheye, pullback, or broader compatibility-sensitive film instability | CHLUMIAG® 3467 | The supported route keeps together leveling, anti-cratering, substrate wetting, and compatibility-first logic | The current company page explicitly says it prioritizes compatibility over a more refined feel |
| The project already is in a true 2K polyurethane route and the sealer forms directionally, but the sealed film still needs cleaner leveling and smoothness before basecoat | CHLUMIFE® 3370 | Longchang ties it directly to isocyanate-reactive 2K PU crosslinking plus leveling, gloss, and smoothness | The supported system boundary matters because the current product page keeps it in UV and solvent systems, not water-based systems |
When CHLUMIWE® 3071 is the better first move
3071 should move first when the sealer still is not getting onto the surface cleanly enough. This is the stronger first route when the visible problem starts as hesitant wetting, uneven spread, or weak surface entry on a prepared panel, primer-surfacer, or other pre-basecoat surface that still does not respond uniformly.
That matters because a sealer is often expected to create a more even bridge into the next coating step. If the sealer never reaches a clean first-contact state, it becomes harder to judge whether later crater rescue or reactive leveling actually helped. 3071 is usually the better first route when:
- the sealer still beads, hesitates, or spreads unevenly before the next layer,
- the team needs a first benchmark focused on surface entry before higher-level film tuning,
- the prepared surface still behaves like a difficult-to-wet substrate, or
- the buyer wants a direct wetting-and-penetration route instead of jumping immediately into broader compatibility work.
The watchpoint stays visible. Longchang also notes that 3071 may stabilize foam in water-based systems, so it is better treated as a wetting-first decision, not as a complete answer to every sealer defect.
When CHLUMIAG® 3467 is the better first move
3467 should move earlier when the sealer can reach the surface, but still shows craters, fisheyes, pullback, or broader signs that the real bottleneck is a compatibility-first leveling problem inside the film. This route is stronger when the issue is not simply poor entry, but unstable sealer formation after application begins.
That distinction matters because a sealer that pulls back or breaks up can leave the next basecoat standing on an unreliable surface. Longchang’s current product page is useful here because 3467 is not positioned only as a feel modifier. The supported route keeps together penyamarataan, anti-kawah, pembasahan substrat, Dan compatibility-first logic.
3467 is usually the better first route when:
- the sealer still shows crater-sensitive breakup or pullback,
- the formulator wants a compatibility-led stabilization route before moving to finish refinement,
- the sealed film still looks unstable enough that later basecoat evaluation would be misleading, or
- the project needs a more forgiving bridge between earlier preparation and the next coating layer.
The watchpoint is also clear. Longchang says this route prioritizes system compatibility, so it is most useful when the sealer film still needs to stabilize, not when the main job already has shifted to final appearance polish.
When CHLUMIFE® 3370 is the better first move
3370 deserves the earlier screen when the project already is a true 2K polyurethane crosslinking route and the sealer can form directionally, but the film still needs a cleaner reactive leveling and smoothness path before basecoat. This is the better first move when the team no longer is fighting obvious wetting failure or crater rescue, but still does not trust the sealed surface as a calm enough foundation for the next layer.
Longchang’s current product page is especially helpful here because 3370 is supported not just as a generic silicone surface aid, but as a reactive hydroxyl polyester-modified polysiloxane that reacts with isocyanate and is suitable for two-component polyurethane crosslinking systems. The supported route also ties it directly to penyamarataan, kilap, Dan kelancaran.
3370 is usually the better first route when:
- the sealer already reaches and stays on the surface reasonably well,
- crater and pullback behavior are no longer the main blocker,
- the team wants a cleaner sealed-film read before the basecoat step, or
- the project specifically wants a more reactive polyurethane route rather than a broader cross-system additive screen.
The watchpoint should stay visible. The current Longchang product page keeps 3370 in Sistem UV dan pelarut, not water-based systems, so its system boundary should remain part of the selection logic.
How buyers should choose before the first sealer sample round
1. Start with the real first failure in the sealer
If the film still struggles to wet and spread, start with 3071. If the sealer reaches the surface but still breaks into crater or pullback behavior, move 3467 forward. If the sealer already forms and the main question is smoother reactive leveling before basecoat, start with 3370.
2. Keep pre-basecoat surface entry separate from film stability
A sealer that will not spread and a sealer that spreads but then pulls back are not the same additive problem. Separating those routes early usually makes the first sample round cleaner.
3. Keep reactive leveling separate from defect rescue
If the film still has basic wetting or crater problems, that can distort how the team judges every later reactive leveling additive. Fix the earlier bottleneck first.
4. Respect the system watchpoints
3071 may stabilize foam in water-based systems. 3467 prioritizes compatibility more than finish feel. 3370 belongs to a true 2K PU reactive route and its current company-supported fit stays in UV and solvent systems, not water-based systems. Those boundaries are part of the selection logic, not a footnote.
5. Keep the first trial set small and honest
For many 2K PU sealer projects, the cleanest first plan is one 3071 wetting route, satu 3467 compatibility route, dan satu 3370 reactive leveling route. That usually teaches more than forcing several near-neighbor additives into the same first screen.
Rute Longchang yang direkomendasikan dari halaman ini
- Rute membasahi terlebih dahulu: CHLUMIWE® 3071
- Compatibility-first route: CHLUMIAG® 3467
- Reactive 2K PU leveling route: CHLUMIFE® 3370
- Gambaran umum klaster: Pelapis dan Aditif Tinta CHLUMICRYL®
- Related stage page: How to Choose Additives for 2K Polyurethane Primers
- Related stage page: How to Choose Additives for 2K Polyurethane Basecoats
- Related finish page: Cara Memilih Aditif Permukaan untuk Lapisan Atas Poliuretan 2K
- Related finish page: How to Choose Surface Additives for 2K Polyurethane Clearcoats
- Halaman cacat terkait: How to Choose Additives for Coating Fisheyes
PERTANYAAN YANG SERING DIAJUKAN
Which additive should I screen first if a 2K polyurethane sealer still will not wet the surface evenly?
Usually 3071, because Longchang supports it as a low-surface-tension wetting route with spreadability, wetting, and penetration that fit the first-contact problem more directly than a crater-only or reactive-leveling route.
When should 3467 move ahead of 3071?
3467 should move ahead when the sealer can already reach the surface but still shows crater-sensitive breakup, fisheyes, or pullback that read more like a compatibility and leveling problem than a simple wetting shortfall.
When does 3370 make more sense than the other two?
It makes more sense when the project already is in a true 2K PU route, the sealer film forms directionally, and the main question has shifted into reactive leveling, gloss, and smoother sealed laydown before basecoat.
Is this page the same as the 2K PU primer or basecoat pages?
No. Those pages answer adjacent stage questions. This page narrows the buyer question to the sealer stage before basecoat and separates surface entry, compatibility-first crater cleanup, and reactive leveling for that specific pre-basecoat window.
Can one of these additives solve every 2K PU sealer issue?
No. Their supported first-screen logic is different enough that buyers should not treat them as interchangeable. The faster route is to identify whether the problem starts at surface entry, compatibility-sensitive film instability, or reactive smoothing before the next layer.
Need a tighter shortlist?
If your 2K polyurethane sealer project is stuck between poor surface wetting, crater-sensitive film instability, Dan reactive leveling before basecoat, stop treating them as the same additive request. Start with the real bottleneck. That usually makes the next CHLUMICRYL® sample decision faster and more commercially useful.