What is Accelerator Finish Primer 442 and why choose it?
ALEXSEAL A4429 Accelerator Finish Primer 442 is a paint auxiliary additive designed specifically to speed up the drying of ALEXSEAL Finish Primer 442. Supplied as a transparent, solvent-based liquid, it is intended for professional, industrial serial painting operations where reduced drying times, faster tape-readiness and higher throughput are required.
By incorporating this accelerator into the catalyzed Finish Primer 442 system, users can shorten dust-free, tape-dry and full-cure times across a wide temperature range, while maintaining the mechanical and aesthetic performance of the epoxy primer when used as directed.
Main features
- Dedicated accelerator for ALEXSEAL Finish Primer 442: Formulated to work as part of the ALEXSEAL epoxy finish primer system.
- Reduces drying time: A4429 decreases dust-free, tape-dry and full-cure times of Finish Primer 442 when added up to the recommended level.
- Fast-reacting solvent blend: Paint auxiliary agent supplied in a mixture of organic solvents with a flash point of 25 °C.
- Transparent liquid: Colour according to product name, liquid state at 20 – 25 °C.
- High solvent content: VOC content 86 % (760 g/l) according to Directive 2010/75/EU.
- Professional-use only: Intended for industrial and professional users with appropriate application controls and documentation.
Technical specifications
Product identity
- Commercial name: ALEXSEAL A4429-Accelerator Finish Primer
- Intended role: Accelerator for ALEXSEAL Finish Primer 442
- Use of the mixture: Industrial serial painting
- Chemical nature: Paint auxiliary agent in a mixture of organic solvents
Key physical and chemical data
- Physical state: Liquid (20–25 °C, 1,013 hPa)
- Colour: Transparent (according to product name)
- Odour: Characteristic
- Flash point: 25 °C (ISO 13736)
- Auto-ignition temperature: > 400 °C
- Upper explosion limit: 10 % (V)
- Lower explosion limit: 1 % (V)
- Water solubility: Insoluble
- Miscibility with water: Immiscible
- Vapour pressure: Approx. 100 hPa at 50 °C
- Density: 0.88 g/cm³
- Viscosity, kinematic: > 6 mm²/s
- Flow time: 11 s (DIN 53211, 4 mm); < 10 s (ISO 2431, 6 mm)
Hazard classification (Regulation (EC) No 1272/2008)
- Flam. Liq. 3 (H226): Flammable liquid and vapour.
- Acute Tox. 4 (H332, H312): Harmful if inhaled or in contact with skin.
- Skin Corr. 1C (H314): Causes severe skin burns and eye damage.
- Eye Dam. 1 (H318): Causes serious eye damage.
- STOT SE 3 (H335): May cause respiratory irritation.
- STOT RE 2 (H373): May cause damage to organs through prolonged or repeated exposure.
- Asp. Tox. 1 (H304): May be fatal if swallowed and enters airways.
- Aquatic Chronic 3 (H412): Harmful to aquatic life with long lasting effects.
Main hazardous components
- Xylene: ≥ 40 – ≤ 100 % (Flam. Liq. 3; Acute Tox. 4; Skin Irrit. 2; Eye Irrit. 2; STOT SE 3; STOT RE 2; Asp. Tox. 1; Aquatic Chronic 3)
- Ethylbenzene: ≥ 20 – < 25 % (Flam. Liq. 2; Acute Tox. 4; STOT RE 2; Asp. Tox. 1; Aquatic Chronic 3)
- 2,4,6-tris(dimethylaminomethyl)phenol: ≥ 12.5 – < 20 % (Acute Tox. 4; Skin Corr. 1C; Eye Dam. 1)
Mixing and dosage with ALEXSEAL Finish Primer 442
- Standard Finish Primer 442 mix: 1 part by volume Finish Primer 442 base (P4420/P4423) + 1 part by volume Converter C4427, reduced 15–25 % by volume with R4042 Epoxy Primer Reducer (example: 1 : 1 : 1/2 for 25 % reduction).
- Use of A4429 Accelerator: Add up to 12.5 % A4429 to the catalyzed 442 epoxy primer (base + converter).
- Example for 12.5 % with A4429 only: 2 quarts base + 2 quarts converter + 1 pint A4429 (mixing example 1 : 1 : 1/4). A4429 replaces this proportion of reducer.
- Example for 25 % total reduction (accelerator + reducer): 1 part base : 1 part converter : 1/4 part A4429 : 1/4 part R4042 (overall 25 % reduction, split equally between accelerator and reducer).
- Effect on pot life: Pot life of the primer system is reduced from approx. 12 hours to approx. 6 hours at 15–30 °C when A4429 is used.
- Restriction: When using ALEXSEAL Finish Primer 442 directly on metal, the use of A4429 Accelerator Finish Primer 442 is not recommended.
Applications and use cases
- Industrial marine and protective coatings: Designed as an accelerator within the ALEXSEAL Finish Primer 442 system for professional applications.
- Situations requiring shorter turnaround times: Workshop or yard environments where reduced drying and recoat times of Finish Primer 442 are needed to increase productivity.
- Controlled professional environments: Should be used where ventilation, exposure control and personal protective equipment can be reliably implemented.
FAQ
How much A4429 Accelerator can be added to Finish Primer 442?
ALEXSEAL specifies that up to 12.5 % by volume of A4429 may be added to the catalyzed 442 epoxy primer (base plus converter). This percentage forms part of the overall reduction of the product.
Does A4429 replace some of the reducer?
Yes. When A4429 is used to achieve 12.5 % reduction, it replaces that same quantity of reducer. For a 25 % total reduction, 12.5 % is A4429 and 12.5 % is R4042 Epoxy Primer Reducer.
Can A4429 be used when Finish Primer 442 is applied directly to metal?
No. When Finish Primer 442 is used directly on metal substrates, the use of A4429 Accelerator Finish Primer 442 is not recommended.
What effect does the accelerator have on pot life?
With A4429, the pot life of the Finish Primer 442 system is approximately 6 hours at 15–30 °C, compared with about 12 hours without accelerator.
Is Accelerator Finish Primer 442 a ready-to-use coating?
No. It is not a stand-alone coating; it is a paint auxiliary agent intended only as an additive to ALEXSEAL Finish Primer 442.
Is the product suitable for non-professional users?
No. Both the technical data sheet and safety data sheet state that the product is for professional or industrial use only.
How flammable is A4429?
The product is classified as a flammable liquid, Category 3, with a flash point of 25 °C and must be kept away from ignition sources.
Section 14 – Transport information
- UN number / ID number: UN 3469
- UN proper shipping name (ADR / IMDG / IATA): PAINT RELATED MATERIAL, FLAMMABLE, CORROSIVE
Transport hazard classes
- ADR class: 3 (subsidiary risk 8)
- IMDG class: 3 (subsidiary risk 8)
- IATA class: 3 (subsidiary risk 8)
Packing group
- ADR packing group: III
- Classification code (ADR): FC
- Hazard identification number (ADR): 38
- ADR labels: 3 (8)
- Tunnel restriction code (ADR): (D/E)
- IMDG packing group: III; labels 3 (8); EmS code F-E, S-C
- IATA cargo aircraft: Packing instruction 365, packing group III, labels Flammable Liquids, Corrosives
- IATA passenger aircraft: Packing instruction 354, LQ packing instruction Y342, packing group III, labels Flammable Liquids, Corrosives
Environmental hazards
- ADR – Environmentally hazardous: No
- IMDG – Marine pollutant: No
Additional transport notes
- If transported within the user’s premises, containers should always be closed, upright and secure.
- Personnel transporting the product should be aware of procedures in case of incident or spillage.
- Transport classification may vary depending on mode of transport, packaging size and local regulations.
Section 8 – Individual protection measures
Engineering controls
- Provide adequate ventilation through local exhaust and general extraction.
- If ventilation is insufficient to maintain aerosol and solvent vapour concentrations below occupational exposure limits, suitable respiratory protection must be used.
Personal protective equipment (PPE)
Eye and face protection
- Wear safety goggles to protect against solvent splashes.
Hand protection
- Use chemical-resistant protective gloves tested in compliance with EN 374.
- Recommended materials for short-term contact (splash protection): nitrile rubber or neoprene.
- Minimum material thickness: > 0.4 mm.
- Minimum breakthrough time: > 480 minutes.
- Check gloves for workplace suitability (mechanical resistance, product compatibility, antistatic properties) before use.
- Replace gloves immediately when damaged or when first signs of wear appear.
- Preventive skin protection (skin protection cream) and immediate washing of contaminated skin are recommended.
Skin and body protection
- Wear anti-static protective clothing made from natural fibres (e.g. cotton) or heat-resistant synthetic fibres.
- After contact, clean exposed skin thoroughly.
Respiratory protection
- If solvent concentration exceeds workplace exposure limits, wear respiratory protection approved for organic vapours.
- Use a half-mask with appropriate cartridge or an air-fed respirator.
- Dry grinding, torch cutting or welding can produce hazardous dusts and vapours; where possible, use wet methods and local exhaust ventilation. If exposure cannot be avoided, wear suitable respiratory equipment.
- When operators work inside spray booths during spraying, they should wear compressed air-fed respirators until aerosol and vapour concentrations fall below the exposure limits.
General protective measures
- Do not eat, drink or smoke during use.
- Avoid contact with skin, eyes and clothing.
- Avoid inhalation of dust from sanding, particulates and spray mist arising from application.
*Contenido generado por IA
