WATERPROOFING BOSTIK POWERMIX

🔍 What it is Powermix is a flexible, fibre-reinforced and specially-modified high-grade acrylic polymer which is mixed with Portland cement to form a waterproofing system for concrete substrates. bostik.com +2 bostik.com +2 It is described as a “flexible cementitious waterproofing”. bostik.com +1 ✨ Key Features & Benefits According to the technical data sheet and product details: Superior water impermeability — designed to stop water ingress. bostik.com +1 Flexible and fibre-reinforced — the added fibres and polymer help it move with the substrate and bridge hairline cracks. bostik.com +1 Compatibility with concrete (cementitious substrates) — since it is mixed with Portland cement, it bonds well with concrete surfaces. bostik.com +1 High water vapour transmission — the film allows vapour to pass, helping the substrate breathe. bostik.com UV resistance — the polymer component provides resistance to UV exposure. Mackun Hardware +1 Monolithic, seamless film — when applied correctly, no joints/laps are required, reducing leak-points. bostik.com Tintable — can be tinted for coloured waterproof finishes. bostik.com Longer service life — the product is designed for durability. bostik.com +1 🛠 Application & Usage Here are the main usage details: Mix ratio: For one gallon of Powermix polymer you mix with 4.5 kg of Portland cement (or 3.5 litres of Portland cement) to cover about 8 m². bostik.com +1 Surface preparation: Clean the substrate: remove laitance, dust, oil, previous coatings. bostik.com Wet the surface to Saturated Surface Dry (SSD) condition (i.e., damp but no standing water) before applying. bostik.com Detail all critical areas (corners, joints, protrusions) before full application. bostik.com Primer coat: Apply a primer coat diluted (1 part Powermix : 2 parts water) to seal the pores of the substrate. bostik.com Application of main coats: After primer dries, apply the first coat of the prepared mixture by brush. bostik.com After 1-2 hours curing, apply a second coat (often applied by roller in opposite direction for better coverage). bostik.com Let dry for at least 24 hours before flood testing or further traffic. bostik.com Where to use: Typical areas include roof decks, firewalls (colored waterproofing), concrete gutters, etc. Buildmate +1 Post-application: For exposed areas subject to regular traffic (e.g., rooftop decks), a concrete topping is recommended over the waterproofing layer. New Golden Hub Corp +1 📦 Packaging & Availability Available in sizes such as 4 litres (≈1 gallon) and 16 litres pails. bostik.com +1 Local stores show Philippine pricing, e.g., one retailer listing at around ₱2,975 for a “Powermix Block A350” variant. New Golden Hub Corp ✅ Why Choose It If you are waterproofing concrete surfaces (flat roof slabs, balconies, gutters, firewalls) and need a system that bonds well, is flexible (can deal with slight movements/cracks), and forms a monolithic seamless barrier, Powermix is a strong candidate. It’s made for local conditions (e.g., the Philippines), where UV exposure and heavy rainfall / humidity are considerations. (See the Bostik article about the importance of waterproofing in the Philippines referencing this product) bostik.com ⚠️ Considerations & Tips Proper surface preparation is critical — if substrate isn’t cleaned or is saturated with water/contaminants, the performance will drop. The correct mix ratio must be followed (polymer + cement) to achieve the intended benefit. Two coats recommended, with the second applied in opposite direction for uniform film. For areas with foot or vehicular traffic, protective topping is recommended — the waterproofing layer alone may not be designed to withstand heavy abrasion or constant traffic. Ensure ambient and substrate conditions are suitable (e.g., no freezing, surface temp/humidity within acceptable ranges though I didn’t find a detailed full list in the basic datasheet) Check latest Technical Data Sheet (TDS) with manufacturer to confirm any updated mix or coverage data. bostik.com +1 If you like, I can pull up the full Technical Data Sheet (TDS) for you (coverage, film thickness, drying time, typical performance) and check local distributor pricing in Metro Manila. Would you like that?