About STP ShaliFloor 2AC PU TC

STP ShaliFloor 2AC PU TC is the weathering finish that most exposed floor systems are missing. It is a two-component, liquid aliphatic acrylic polyurethane coating cured with an isocyanate hardener, formulated to sit at the very top of a floor build-up where it takes the full brunt of sun, rain and traffic. The cured film is tough and abrasion-resistant yet retains enough flexibility to move with the slab, and it shrugs off solvents, fuel spillage and mild chemical contact. Most importantly, its aliphatic backbone holds colour and gloss where a standard aromatic epoxy would chalk, fade and turn yellow within a season of outdoor exposure.

In practice the coat is specified in two roles. On exterior concrete floors, terraces, ramps and podium decks it is applied directly over a suitable primer or body coat as the visible, wearing surface. Over indoor-grade epoxy systems that must face daylight, it becomes a protective sacrificial layer, taking the UV load so the coloured epoxy underneath keeps its finish. For engineers and applicators across Delhi NCR and pan-India, Space Arc supplies ShaliFloor 2AC PU TC as an authorised STP distributor, with the surface-prep and priming guidance that decides whether an aliphatic top coat performs for years or lifts in months.

The technical insight

The performance difference comes down to where the double bonds sit. Aromatic polyurethanes carry unsaturated benzene rings in the backbone; UV energy breaks those bonds, which is what drives the chalking, ambering and gloss collapse you see on epoxy floors left in daylight. ShaliFloor 2AC PU TC uses an aliphatic acrylic polyurethane instead, where the reactive chemistry is built on saturated, UV-stable linkages that sunlight cannot readily cleave. The acrylic-PU hybrid also delivers a hard, glossy, tightly cross-linked surface once the isocyanate component cures the resin, giving abrasion resistance (ASTM D4060) and tensile strength (ASTM D638) alongside the colour stability. Because the film stays flexible rather than glass-brittle, it accommodates thermal movement and light substrate cracking without delaminating, which is exactly the combination an outdoor deck needs.

Where it is used

• UV-facing top coat over aromatic epoxy floor systems that must be exposed to daylight
• Open and rooftop car park decks and podium parking
• External ramps, driveways and vehicle turning areas
• Terraces, balconies and exposed walkways on concrete
• Airport aprons, service yards and other exposed industrial floors
• Outdoor sports courts and recreational hard surfaces
• Loading bays and external plant areas needing fuel and mild-chemical resistance
• Refurbishment recoat over sound, cured PU or epoxy surfaces to restore gloss

Key advantages

• Aliphatic chemistry resists yellowing and holds colour under prolonged UV exposure
• High-gloss finish that stays glossy outdoors rather than chalking
• Tough and abrasion-resistant while remaining flexible enough to bridge minor movement
• Resists solvents, fuel and oil spillage and mild chemical contact
• Protects the coloured epoxy or PU layer beneath, extending the whole system’s life
• Fast handling window with touch-dry in roughly 2-4 hours at ambient
• Applies by brush, roller or spray to suit large decks or detailed areas
• Available across a wide colour range for demarcation and finish requirements

Limitations & considerations

• It is a thin finish coat, not a build layer; it needs a sound primed or epoxy base beneath it to carry load
• Two-component product with a limited pot life of about 2-3 hours once mixed, so batch what you can lay
• Requires a clean, dry, contaminant-free substrate; oil, grease, dust or damp will cause failure
• Reaches full chemical and mechanical cure only after about 7 days, so protect from heavy service until then
• Ambient temperature and humidity during application and cure directly affect the result and must be controlled

Selection & best practice

Specifications

Industry use cases

How we position STP ShaliFloor 2AC PU TC

ShaliFloor 2AC PU TC is the UV-facing finish, not the whole floor. Specify it over an STP body coat such as a ShaliFloor epoxy self-levelling or coating system, so the epoxy delivers thickness and mechanicals while the aliphatic PU handles daylight. Where a lower-VOC or clear car-deck top coat is preferred, STP’s own ShaliFloor 2PU FC and ShaliUrethane PU TC 2K sit in the same aliphatic-PU family and are natural alternates. Across our other brands, comparable roles are filled by Fosroc’s Nitoflor and Trafficguard deck systems and by MC-Bauchemie and Sika PU floor coatings; talk to Space Arc about matching the top coat to the base system you have already chosen.

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