Bautech Polyurethane Mastic 290 ML Black (25 Pieces)

Bautech Polyurethane Sealant 290 ml Black — 25 Pieces

Bautech Polyurethane Sealant is a one‑component, high‑elasticity polyurethane joint‑filling and sealing compound that cures by reaction with atmospheric moisture. Supplied in Black, it comes in 290 ml cartridges, 25 units per carton. Reliable for joints requiring high movement capability, exterior facades, precast and metal assemblies, it delivers permanent flexibility and waterproof performance.

Technical Specifications

• Brand: Bautech
• Product Type: One‑component polyurethane sealant
• Colour: Black
• Volume: 290 ml per cartridge
• Packaging: 25 pieces per carton
• Chemical Base: Polyurethane (solvent‑free)
• Curing Mechanism: Moisture‑curing from ambient air
• Elasticity / Movement Capability: ±25 %
• Shore Hardness (A): 25
• Paintable: Yes — after full cure
• Adhesion: Strong bond even to slightly damp surfaces
• Thixotropic: Non‑slump; will not run or sag on vertical or overhead surfaces
• Temperature Resistance: -40 °C to +90 °C (after curing)
• Application Temperature: +5 °C to +35 °C
• Surface Dry: Approx. 30–60 minutes at 23 °C / 50 % RH
• Full Cure: 24 hours (depending on thickness and ambient humidity)
• Key Properties: Odourless, mould‑resistant, non‑staining, non‑shrinking, waterproof
• Shelf Life: 12 months in unopened packaging

Applications

• Precast and concrete panel joints; expansion and dilation joints
• Exterior cladding — sealing between PVC, marble, concrete and aluminium
• Roof and gutter junctions; roofing detail work
• Glass balcony installations and perimeter frame joints
• Metal structures, vehicle bodies, caravans and superstructure sealing
• Door, window and joinery perimeters — both fixed and moving connections
• Floor joints and surfaces subject to foot traffic
• Sealing and bonding between timber, concrete, brick, metal, aluminium, PVC and ceramic surfaces

Product Advantages

• High Elasticity: Accommodates building movement and temperature changes without cracking or tearing; ±25 % movement capability
• Strong Adhesion: Bonds well even to damp substrates; primer is generally not required
• Thixotropic Formulation: No sagging or running on vertical and overhead work; can be applied in thick layers
• Paintable Finish: Once fully cured, accepts acrylic, polyurethane and synthetic paints reliably
• Durable Performance: Waterproof, chemical‑resistant and weather‑proofed after curing
• Easy to Use: Single‑component — no mixing required; apply directly from a standard caulking gun
• Black Colour Compatibility: Provides a seamless aesthetic match for metalwork, roofing, facades and industrial‑style surfaces
• Cost‑Effective Bulk Pack: 25‑piece carton is ideal for construction sites and frequent ongoing use

Application Instructions

• Surfaces must be dry, clean, and free from dust, oil, grease and loose debris
• Maintain a 2:1 width‑to‑depth ratio; minimum joint depth: 6 mm
• For wider joints (above 15 mm), install backing rod/foam to prevent three‑sided adhesion
• Cut the cartridge tip at an angle matching the joint width, fit the nozzle, and apply with steady, even pressure
• Tool and smooth the joint while wet using a damp cloth or finishing trowel; remove excess material
• Protect from direct water exposure during the first 24 hours after application
• Important Note: UV resistance is limited; if exposed to prolonged direct sunlight outdoors, the sealant must be top‑coated with paint
• Not Suitable For: Permanently submerged surfaces, glass requiring pure silicone, or areas in contact with food

Frequently Asked Questions

Are other colours available?
Yes — White, Grey and Brown options are also offered.

Can it be painted over?
Yes — after full cure, it accepts water‑based, acrylic and synthetic paints without issue.

How long does full curing take?
At 23 °C and 50 % relative humidity, fully cured in approx. 24 hours. Lower temperatures and dry conditions will extend curing time.

When does it become fully waterproof?
It resists light water contact once surface‑dry; full waterproof properties develop only after complete curing.

How much coverage does one cartridge provide?
Approx. 3 linear metres at a 10 mm width; yield varies according to joint dimensions.