Akfix P645 is a one-component, high-modulus polyurethane (PU) sealant that cures on contact with atmospheric moisture to form a tough, permanently elastic rubber seal. Engineered for vehicle body construction and demanding sheet-metal work, this fast-curing black PU sealant bonds and seals metal, ceramic, glass, timber and most plastics — sealing out water, air, gas and dust while absorbing vibration and structural movement.

Where ordinary silicone fails on metal, P645 delivers. It is thixotropic and non-sag, so it holds its bead on vertical and overhead joints without slumping. Once cured it is fully over-paintable, sandable, and does not pick up dust or dirt — giving you a clean, professional finish on bodywork, gutters, ducting and structural steel alike.

Product Identification

Property	Detail
Product name	Akfix P645 PU Metal Sealant (Automotive & Construction)
Product code	P645
Colour supplied	Black (RAL 9005) — also available in White (RAL 9016), Grey and Red on order
Chemical basis	One-component polyurethane (1K PU) prepolymer
Curing mechanism	Moisture cure — reacts with atmospheric humidity
Modulus classification	High modulus
Consistency	Thixotropic paste, non-sag
Cartridge size	310 ml (600 ml sausage/cartridge available on order)
Carton quantity	12 cartridges per box
Manufacturer	Akfix / Akkim Construction Chemicals, Türkiye

Why Professionals in Kenya Choose Akfix P645

Fast curing, high modulus — builds strength quickly so you can move the job along the same day. Permanently flexible — the cured bead flexes with thermal expansion, vibration and load without cracking or splitting. Exceptional thixotropy / non-sag consistency — clean, sharp beads on vertical, sloped and overhead seams. Outstanding multi-surface adhesion — sheet steel, galvanised iron, aluminium, stainless steel, copper, ceramics, glass, wood, concrete and most plastics, usually with no primer on clean metal. Over-paintable — accepts most water-based and synthetic paint systems after skinning; ideal for body shops and coated roofing. Non-sticky, dirt-resistant surface — the finished seam stays looking clean rather than collecting dust. High mechanical and abrasion resistance — withstands wash bays, road grit, foot traffic and weather. Vibration and noise damping — reduces panel drumming and rattle in bodies, trailers, containers and ducting. Weather, UV and moisture resistant — built for Kenya's sun, rain and coastal humidity. Improved storage stability — reliable performance right through the shelf life. Solvent-free and isocyanate-cured — low odour once skinned, safe for enclosed workshop use with normal ventilation.

WHERE TO USE AKFIX P645 (Applications)

Automotive & Transport

Vehicle body seam sealing on sheet-metal joints, floor pans, sills and wheel arches Panel bonding and flange sealing on cars, matatus, lorries and pickups Bus, truck and trailer body construction and repair Container, caravan, campervan and RV roof, wall and panel seams Boot floors, spare-wheel wells and under-body seam protection Vibration damping on panels prone to drumming and rattle Windscreen and glazing surround sealing (non-structural) Tanker and skip body fabrication

Construction & Metal Fabrication

Gutters, downpipes, valleys, flashings and spouts Mabati and metal roofing seams, ridge caps and overlaps HVAC ductwork, ventilation shafts and air-handling housings Steel structure joints, cladding overlaps and purlin junctions Prefabricated and modular steel buildings Metal door and window frame perimeter sealing Silos, tanks, hoppers and light industrial enclosures Expansion and connection joints in concrete-to-metal interfaces Waterproof sealing around penetrations, brackets and fixings

Marine & Industrial

Boat deck fittings and above-waterline seams Machine housings, guards and enclosures Cold rooms, refrigeration panels and food-industry cladding (external seams)

SECTION 5 — HOW TO USE AKFIX P645 (Step-by-Step Application Guide)

Step 1 — Prepare the surface

Surfaces must be clean, dry, sound and free of dust, grease, oil, rust, loose paint, old sealant, wax and release agents. Wire-brush or abrade rust back to bright metal. Degrease with isopropyl alcohol, acetone or a proprietary cleaner and allow to flash off completely. Adhesion failure is almost always a surface-preparation failure.

Step 2 — Mask and set the joint

Apply masking tape along both sides of the joint for a razor-sharp edge. Insert closed-cell polyethylene backer rod in deep joints so the sealant bonds to two faces only, never three. On porous substrates, prime where the substrate demands it and allow the primer to flash off.

Step 3 — Prepare the cartridge

Cut the cartridge thread cleanly. Screw on the supplied nozzle and cut the nozzle tip at a 45° angle to the required bead width — cut small first, you can always enlarge it. Load into a manual, pneumatic or electric caulking gun.

Step 4 — Apply the sealant

Hold the gun at roughly 45° and extrude with steady, continuous pressure, pushing the bead ahead of the nozzle so the sealant is forced into the joint rather than laid on top of it. Avoid trapping air. Work in one continuous pass per joint wherever possible.

Step 5 — Tool the bead

Tool and smooth within 10–15 minutes, before skin forms. Use a spatula, jointing tool or soapy-water-dampened finger. Tooling is not cosmetic — it presses the sealant into full contact with both joint faces and is what makes the seal watertight.

Step 6 — Remove masking tape

Peel the tape away immediately after tooling, while the sealant is still wet. Pull at a shallow angle away from the bead.

Step 7 — Allow to cure

Leave undisturbed. Cures at approximately 3 mm per 24 hours — a 6 mm bead needs about two days, a full 10 mm joint 5–7 days. Curing is faster in warm, humid conditions and slower in cold, dry conditions. Do not expose the fresh bead to water or wash the vehicle for at least 24 hours.

Step 8 — Paint (optional)

Once skinned and firm, the sealant can be over-painted with most water-based and synthetic paint systems. Always test paint compatibility on a small sample first — some alkyd paints dry slowly over elastic sealants. For best results, allow full cure before applying finish coats.

Step 9 — Clean up

Remove uncured sealant immediately with acetone, white spirit or a PU cleaner. Clean tools before the sealant skins. Cured sealant can only be removed mechanically — by cutting, scraping or abrading.

Professional Tips

Warm the cartridge to about 20°C before use in cold morning conditions — it guns far more easily and tools smoother. Humidity is your friend. PU sealants need atmospheric moisture to cure. In very dry conditions, a light mist of water on the tooled surface accelerates skinning. Never mix with silicone. Silicone residue on a surface will destroy PU adhesion. Use dedicated tools and rags. Don't over-thin the bead. A very thin film cures brittle; keep to the recommended joint dimensions. Start every job with a test bead on offcut material to check adhesion and paint compatibility. Buy the right quantity. Once opened, a cartridge has limited working life — use the coverage table above to order accurately.

5.2 Safety & Handling

Contains isocyanates. Wear nitrile gloves and safety glasses; use in well-ventilated areas. Avoid skin and eye contact. On skin contact, wipe off immediately and wash with soap and water. On eye contact, rinse with clean water for 15 minutes and seek medical advice. Keep out of reach of children. Do not ingest. Do not apply below +5°C or onto frozen, damp or contaminated surfaces. Dispose of empty cartridges in accordance with local regulations. Do not incinerate. Consult the Safety Data Sheet (SDS) before industrial use — available on request from Shabbiri Hardware.

FREQUENTLY ASKED QUESTIONS

Q: What is Akfix P645 used for? A: Akfix P645 is a high-modulus polyurethane sealant used to seal and bond sheet metal in vehicle body construction, gutters, downpipes, ventilation ducts, metal roofing seams, steel structures and container or trailer bodies. It seals out water, air, gas and dust and damps vibration. Q: Is Akfix P645 paintable? A: Yes. Once it has skinned, P645 can be over-painted with most water-based and synthetic paint systems, and it can be sanded once fully cured. Always test paint compatibility on a small area first. Q: How long does Akfix P645 take to dry? A: It skins in roughly 40–60 minutes and cures at about 3 mm per 24 hours. A typical 5–6 mm bead is firm within a day or two; a full 10 mm joint reaches complete cure in 5–7 days. Warm, humid weather speeds it up. Q: Can I use P645 on aluminium and galvanised iron? A: Yes. It bonds excellently to mild steel, galvanised sheet, aluminium, stainless steel and copper on clean, dry, degreased surfaces — usually with no primer required. Q: What is the difference between PU sealant and silicone? A: Polyurethane sealant is paintable, far more abrasion- and tear-resistant, and bonds structurally to metal — which silicone does not. Silicone stays flexible in wet areas and is better for sanitary and glazing work, but it cannot be painted and offers weaker adhesion on metal. Q: Does Akfix P645 come in black? A: Yes. Shabbiri Hardware stocks the 310ml Black (RAL 9005) cartridge, with White, Grey and Red available on order. Q: How many metres does one cartridge cover? A: A 310ml cartridge gives roughly 15.8 metres at a 5 mm bead, 11 metres at 6 mm, or about 4 metres at a 10 mm bead. Q: Can it be used underwater or in an aquarium? A: No. P645 is highly water-resistant and suitable for permanently wet exterior exposure, but it is not designed for permanent immersion or aquarium use. Q: What is the shelf life? A: 12 months from manufacture in unopened cartridges stored between +5°C and +25°C in a cool, dry place. Q: Where can I buy Akfix P645 PU sealant in Kenya? A: Shabbiri Hardware stocks genuine Akfix P645 at both branches — Magadi Road, Ongata Rongai and Tuala, past Nazarene University. Call 0741 042484 or 0745 554008, email info@shabbirihardware.com, or order online at www.shabbirihardware.com Q: What is the price of PU sealant in Kenya? A: Prices vary by size, colour and quantity. Shabbiri Hardware offers competitive retail pricing and trade discounts on carton quantities (12 x 310ml). Call 0741 042484 for today's price and bulk rates.

AVAILABILITY, DELIVERY & CONTACT BLOCK

Buy Akfix P645 PU Sealant Black in Kenya — In Stock at Shabbiri Hardware

Shabbiri Hardware is your trusted supplier of genuine Akfix adhesives, sealants and construction chemicals in Kenya. We stock the full Akfix range for body shops, fabricators, contractors, roofers and DIY customers.

 Our Branches

Rongai Branch Magadi Road, Ongata Rongai, Kajiado County, Kenya Tuala Branch Tuala, Magadi Road — just past Africa Nazarene University, Kajiado County, Kenya

 Call or WhatsApp to Order

0741 042484 | 0745 554008

Email

info@shabbirihardware.com

 Order Online

www.shabbirihardware.com

 Delivery

Same-day and next-day delivery across Ongata Rongai, Tuala, Kiserian, Ngong, Karen, Langata, Rongai, Kitengela, Nairobi CBD and Greater Nairobi. Countrywide courier dispatch available to Mombasa, Nakuru, Eldoret, Kisumu, Thika, Machakos, Naivasha and beyond.