A polymerization emulsifier keeps latex particles from coagulating. A wetting agent gets the wet film onto the wall and mill liquor onto pigment. Craters, fisheyes, and crawling are wetting and contamination problems. Esteem’s paint emulsifiers and Venadol pages are different lists—specify the job, then the grade.
Two Jobs: Polymerization Emulsifier vs Wetting Agent
Decorative waterbornes carry surfactant from at least two decisions. The first is the latex: anionic plus nonionic co-emulsifier during emulsion polymerization. That package is sized for particle nucleation, coagulum, freeze–thaw, and residual load in the dry film. The second is post-add or grind wetting: dynamic surface tension, substrate contact angle, and whether air stays in the mill. Mixing the two is how plants “fix” crawling by dumping more reactor-type ethoxylate into the letdown and then wonder why gloss and scrub fall. Keep them separate. Reactor and plant practice: how to use emulsifiers in paint manufacturing, emulsifiers for paint and coating applications, and emulsifiers for paint & coating.
PRODUCT-219 AG 90 on pigment dispersion is listed as an APEO-free rapid wetting agent for waterborne coatings (90% active in water, low dynamic surface tension). PRODUCT-EP-1030 is listed as a low-foaming wetting agent and tint-strength enhancer that also helps prevent organic-pigment flocculation. Neither is a substitute for the emulsifier table used to make the binder. Pigment grind selection itself is pigment dispersion for architectural coatings.
Cratering, Fisheyes, and Crawling
| Defect | What you are seeing | First response (not “more emulsifier”) |
|---|---|---|
| Cratering | Circular depressions; often a seed (oil, silicone, defoamer droplet) with a dewetting halo | Contamination and additive compatibility; then a compatible wetter/defoamer pair |
| Fisheyes | Dewetting spots that stay bare or thin over hydrophobic contamination | Substrate prep; dynamic wetting if contact angle is the limiter |
| Crawling | Film retracts from edges or beads; holidays on low-energy or dirty surfaces | Prep first; then lower dynamic surface tension at minimum effective dose |
| Pinholes | Burst microfoam late in dry | Grind/application foam control; less foam-stable surfactant, not more |
| Rub-up / weak tint | Colour shift or hiding loss—pigment floc, not a crater | Dispersant millbase work, not a wetting-agent spike |
Gloss, flow, and surfactant bloom after a “successful” wet-out still belong to residual emulsifier and film formation: emulsifiers, gloss, flow and film formation. Coalescent choice is not a wetter: glycol ethers in paints.
When Specialty Additives Like Venadol Enter
Venadol is a gemini surfactant series (Harcros Venadol™) used in paint & coating, inks, adhesives, and industrial systems for wetting, foam control, and related interfacial work. It is not a drop-in for octylphenol/nonylphenol polymerization emulsifiers and not a naphthalene-sulfonate mill dispersant. Use it when FAE wetters (PRODUCT-219 AG 90) or EO/PO grind aids (PRODUCT-EP-1030) do not deliver low dynamic surface tension, low foam, or grind aid without cratering the film.
| Listed Venadol family | What the matrix marks | Coatings use-case to trial |
|---|---|---|
| Venadol 104 (100% active) | Foam control, surface-tension reduction, viscosity stabilization | Handling-sensitive 100% active gemini; solutions exist for easier dose |
| 104 A, BC, DPM, E, H, PA, PG50 | Same 104 properties plus wetting (carrier alcohols/glycols as listed) | When you need 104 performance with a published solvent/glycol cut |
| Venadol 20, 85, 85W | Ethoxylates; wetting (85/85W also emulsification; 20 also grinding aid) | Water-borne coatability / wetting where ethoxylated gemini is specified |
| Venadol 40, 65 | Non-foaming wetting (65 also emulsification) | Wet-out without a foam mountain; 65 if emulsification is also marked on the brief |
| Venadol TG, TGA | Wetting and grinding aid (50% active as listed) | Mill wetting/grind-aid brief—not a latex emulsifier |
| DF-110L, DF-110D | Foam control and defoaming (20% / 32% active) | Aqueous defoam/de-air; synergistic with other defoamers as published |
Venadol usage as published: mix well; add after other surface-active additives; add pigments, fillers, and other solids after Venadol; 0.2–2% of total formulation, confirmed on the real formula. That order matters. Spiking Venadol into a finished can to hide craters fights the recommendation and often seeds new defects. Ethoxylated Venadol grades are described as APE-free gemini surfactants with low dynamic surface tension and low-foaming character for water-borne coatability. Do not specify unlisted grade numbers. Related chemistry: alkoxylates, nonionic surfactants, anionic surfactants.
Foam During Grind
Mill foam is air stabilized by whatever surfactant is in the liquor—polymerization leftovers in a pigment slurry, FAE wetters, or an oversized anionic dispersant. It is not a KPI for “wetting worked.” PRODUCT-EP-1030 is the listed low-foam wetter/tint-strength path for organics and carbon black. Venadol TG/TGA are marked grinding aid plus wetting; DF-110L and DF-110D are the listed Venadol defoamers (formulated nonionic molecular defoamers based on Venadol 104), with some substrate wetting and synergy with other defoamers. Screen crater panels whenever you change defoamer or wetter together. If the mill problem is flocculation or hiding, you are in dispersant selection: architectural pigment dispersion and naphthalene sulfonate vs FAE.
Reactive monomers (Harcryl 1228 family) improve coating polymer performance; they do not wet a cratered wall. Do not put them on a wetting RFQ.
Minimum Effective Dose vs Film Damage
Once the film covers, extra hydrophilic surfactant is a liability: gloss haze, water whitening, dirt pickup, HEUR efficiency loss. Architectural lines on porous Indian masonry tempt over-wetting to hide poor prep. A primer or sealer plus an honest substrate specification beats loading the topcoat with wetter. Ladder the wetter (including Venadol at the published 0.2–2% window) on the worst real substrate, with the commercial defoamer already in. Record water hardness so the lab letdown predicts the plant.
Do not blend polymerization emulsifier, PRODUCT-219 AG 90, and Venadol 104 PG50 hoping to average surface tension. Each leaves a different residual and foam signature. If APEO-free is the claim, say so: 104-series and ethoxylated Venadol are marked APEO-free on the matrix (TGA is not marked APEO-free on that table—do not assume). Hub: paint & coating chemicals.
How to Specify with Esteem
- Name the defect: crater, fisheye, crawl, pinhole, grind foam—or state that you need a grind wetter, not a defect rescue.
- Name the substrate and application (brush/roller/spray; interior emulsion vs exterior masonry).
- Separate the RFQ: latex emulsifier vs PRODUCT-219 AG 90 / PRODUCT-EP-1030 vs named Venadol grade.
- For Venadol, pick from the published list (104 and 104 cuts, 20/40/65/85/85W, TG/TGA, DF-110L/DF-110D) and state carrier constraints (glycol ether, IPA, 2-EH, etc.).
- Confirm addition order and 0.2–2% as a starting window, then plant trial—not a can-side spike.
Related: paint & coating chemicals, emulsifiers for paint & coating, Venadol, emulsifiers and film appearance.
Contact Esteem for samples, or custom synthesis if the wetter cut is not on the published tables.