Bautech Polyurethane Mastic 290 ML Gray (25 Pieces)

Bautech Polyurethane Sealant 290 ml Grey — 25 Pieces

Bautech Polyurethane Sealant is a professional-grade, one-component sealing and filling compound that cures with atmospheric moisture, combining high elasticity and strong adhesion. Supplied in Grey, it comes in 290 ml cartridges, 25 units per carton. With a movement capability of ±25 %, it perfectly accommodates structural expansion, temperature differences and vibration, delivering reliable sealing and durability over many years.

Technical Specifications

• Brand: Bautech
• Product Type: One‑component polyurethane sealant
• Colour: Grey
• Volume: 290 ml per cartridge
• Pack Quantity: 25 pieces per carton
• Curing Mechanism: Moisture‑curing from ambient air
• Maximum Movement Capability: ±25 %
• Shore Hardness (A): 25
• Application Temperature: +5 °C to +35 °C
• Service Temperature: -40 °C to +90 °C (after curing)
• Surface Dry: Approx. 45–60 minutes at +20 °C / 50 % RH
• Cure Rate: Approx. 2.5–3 mm per 24 hours
• Paintable: Yes — after full cure, compatible with acrylic, polyurethane and synthetic paints
• Adhesion: Excellent bond even on damp surfaces
• Flow Behaviour: Thixotropic — no slumping or sagging on vertical and overhead surfaces
• Key Properties: Odourless, mould‑resistant, non‑staining, non‑shrinking, waterproof
• Shelf Life: 12 months in unopened packaging

Applications

• Precast concrete panel joints and expansion joints
• Exterior cladding — sealing between concrete, PVC, aluminium and composite panels
• Roof junctions, gutter connections and roofing details
• Perimeter joints around windows, doors and joinery; glass balcony installations
• Metal structures, vehicle superstructures, caravans and bodywork sealing
• Floor joints and surfaces subject to pedestrian traffic
• Connection joints between timber, concrete, brick, ceramic and marble surfaces
• General‑purpose joint filling in major repair and renovation projects

Product Advantages

• High Elasticity: Adapts to building movement and temperature changes; will not crack, tear or lose its seal
• Strong Adhesion: Bonds excellently to a wide range of substrates; can often be applied without primer even in damp conditions
• Thixotropic Consistency: No sagging or running on vertical and overhead work; can be applied comfortably in thick layers
• Paintable Finish: Can be colour‑matched as required after curing for a neat, integrated appearance
• Grey Colour Compatibility: Blends naturally with concrete, plaster, anthracite frames and industrial‑style surfaces
• Long‑Term Performance: Waterproof, chemical‑resistant and weatherproofed after curing; virtually maintenance‑free for years
• Easy to Apply: One‑component — no mixing needed; applies directly using standard 310 ml caulking guns
• Economical Bulk Pack: 25‑piece carton provides ideal stock levels and favourable unit pricing for large sites and continuous use

Application Instructions

• Surfaces must be dry, clean, and free from dust, oil, grease and loose particles
• Maintain a width‑to‑depth ratio of approx. 2:1; minimum joint depth: 6 mm
• For joints wider than 15 mm, install backing rod/foam to prevent three‑sided adhesion
• Cut the cartridge tip at an angle matching the joint width, attach the nozzle, and apply with steady, even pressure
• Tool and smooth the joint while wet using a damp cloth or finishing tool; remove excess material
• Protect from continuous water exposure during the first 24 hours after application
• For exterior surfaces exposed to prolonged direct sunlight, apply a top coat of paint after curing
• Not Suitable For: Permanently submerged surfaces, glass applications requiring pure silicone, or areas in contact with food

Frequently Asked Questions

Can it be painted over?
Yes — once fully cured (typically 24–48 hours), it accepts water‑based, acrylic and synthetic paints without issue.

Can it be applied to damp surfaces?
It may be applied if the surface is slightly damp, but remove standing or running water before application.

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 the time.

Can it be used on glass?
No — select a pure silicone sealant for glass applications.

How many pieces are supplied?
This product is shipped in cartons containing 25 cartridges.