Fluorocarbon Varnish - Technical Guide for Acrylic

Overview

Acrylic coatings are the premium choice when colour, gloss and long-term appearance matter. The chemistry — an acrylic resin crosslinked with an isocyanate or melamine — gives exceptional UV stability and gloss retention with no chalking or yellowing over a service life measured in decades.

The range at Delshine spans three distinct tiers. Acrylic primers and finishes are the workhorses. Acrylic polyurethane topcoats add the toughness and chemical resistance of a polyurethane film. Fluorocarbon finishes — the PVDF-based system — are the ultimate in colour and gloss retention, used on landmark buildings and infrastructure where a coating must still look new after 25 years.

Acrylic and fluorocarbon systems are the natural choice for steel structures, bridges, ships, and any exterior where the appearance is part of the specification and not just the protection.

Fluorocarbon Varnish: Clear finish

Product identification

The identifiers below are the ones printed on the drum and quoted on the purchase order. Always order and dispatch by code, because the grade and the zinc or temperature variant cannot be inferred from the trade name alone.

Where this product is used

• Exterior architectural steel and landmark building facades
• Bridge handrails, balustrades and structural steelwork
• Marine topsides and superstructure coating
• Road marking paint on highways and urban roads
• Overhead steel structures and cranes
• Fluorocarbon facades on high-rise and commercial buildings
• Roofing and canopy steelwork
• Decorative metalwork, railings and architectural features

How it works in the coating system

The topcoat is the visible, exposed layer of the system. It provides the colour, the gloss and the final resistance to weathering, UV, chemicals and mechanical wear — the properties the specifier and the owner actually see and rely on.

Because it is the only coat fully exposed to the service environment, the choice of topcoat chemistry is the single decision that most affects how a coating system ages. A system that is under-specified at the topcoat will look good on day one and disappoint in five years.

Purpose in the system: The final coat of the system, applied over the intermediate coat.

Technical properties

The values below are the typical published range for this product family. The exact figures for your batch are confirmed on the batch certificate and the current technical data sheet.

Surface preparation

1. Abrasive blast steel to Sa 2½ (ISO 8501-1). For architectural work and fluorocarbon systems, blast to Sa 3 and check the surface profile against the coating manufacturer's requirement, typically 40-70 µm.
2. Ensure all surfaces are free of mill scale, rust, weld spatter, oil and grease. Weld spatter must be removed and the area abraded.
3. Round all edges to a minimum 2 mm radius. This is a visible quality item on architectural work as well as a durability one.
4. For stainless steel or aluminium, use a dedicated wash primer or non-ferrous etch primer — do not use a steel system.
5. Control conditions during application: substrate at least 3 °C above dew point, ambient above 10 °C, humidity below 80%.
6. Mask and plug before coating, and remove masking tape while the coating is still slightly tacky for a clean edge.

Application procedure

Apply by spray for the best appearance and film uniformity, by roller for large flat areas, or by brush where access is restricted.

Aim for a consistent wet film across the whole area. Overlapping passes should be kept wet to avoid a lap line in the finish.

Plan the work so that the coating is applied in manufacturable quantities — a full kit should be mixed and used within the pot life, and any surplus should be discarded rather than saved.

Mixing, ratio and induction time

Two-pack finishes are mixed at the ratio stated on the data sheet, commonly 4:1 or 5:1 by volume for epoxy and 3:1 for polyaspartic and acrylic polyurethane. Use a proper mixing gauge — a mix that is even a few percent off ratio will cure differently and may not meet the published properties.

Cure, recoat window and service readiness

Surface dry in 2 to 6 hours, recoatable in 12 to 24 hours, and fully cured in 7 days. Do not place the structure into service, immersion or heavy loading before full cure, even though the surface will feel dry much earlier.

Coverage and thickness calculation

Typical dry film thickness is 60-100 µm for a conventional finish and 40-60 µm for a high-build polyurethane finish. At 80 µm, one litre covers roughly 8-10 m². Two coats are usually specified where colour, gloss uniformity or coverage hiding matter.

Technical note. Coverage (m²/litre) = (volume solids × 10) / DFT (µm)

Worked example

Advantages

• Outstanding UV and weathering resistance with minimal chalking, fading or yellowing.
• Excellent gloss retention and colour stability over long service periods.
• Fast cure and good throughput — acrylic coatings can often be overcoated within a few hours.
• Good adhesion and flexibility, with excellent edge retention.
• Fluorocarbon finishes provide the best-in-class colour and gloss retention available in the market.
• Wide colour range, including RAL, BS and custom-matched shades for architectural projects.

Limitations and precautions

• Aromatic acrylic finishes will discolour; aliphatic grades are required for UV-exposed service.
• Coverage is relatively thin compared with high-build epoxy — these systems rely on film build from multiple thin coats.
• Fluorocarbon systems are expensive and the coating must be applied by a trained applicator to perform as designed.
• Not suited to immersion in aggressive chemicals without a specific grade.
• Acrylic coatings cure poorly in cold or humid conditions and will blush if applied outside the recommended window.

Storage and shelf life

• Store in original sealed containers in a cool, dry, ventilated store between 5 °C and 30 °C.
• Keep the hardener component away from moisture — it reacts with atmospheric water.
• Protect from direct sunlight and do not store above 40 °C.
• Rotate stock first-in-first-out and observe the labelled shelf life, typically 12 months unopened.

Safety, PPE and ventilation

• Wear chemical-resistant gloves, goggles and suitable protective clothing.
• Use an organic-vapour cartridge respirator when spraying, and supply ventilation for the coating area.
• Keep away from heat and ignition sources; solvents are flammable.
• Do not spray in windy conditions outdoors without appropriate containment and respiratory protection.
• Collect solvent waste and dispose of it through a licensed contractor.

Quality control and inspection

• Check colour and gloss against the approved sample or RAL reference before starting the full area.
• Measure DFT and check for thin spots, particularly over welds, edges and connections.
• Inspect the finished surface for lap marks, sag, orange peel, dust inclusion and solvent entrapment before accepting the coat.

Pricing and how to order

Delshine quotes this product per square metre at a specified dry film thickness, or per drum/litre depending on the project. The material cost is usually the smallest part of the installed cost — surface preparation, access and application labour dominate. Send us the substrate, the service conditions and the required DFT and our technical team will return a full system recommendation with a firm price.

Acrylic and fluorocarbon coatings are quoted per square metre at a stated dry film thickness, with colour and sheen usually driving the price difference. Fluorocarbon is several times the price of a standard acrylic finish — a 2,000 m² facade moves from a modest figure to a significant one purely by changing the topcoat, which is why the specification stage matters so much.

Frequently asked questions

The questions below are the ones our technical team is asked most often about this product family.

Related products

These products are normally used in the same system as the product described above.

• Acrylic Primer (White, Grey)
• Acrylic Finish (All Colors)
• Acrylic Road Marking Paint
• Road Marking Paint (Yellow)

See all products