Mapei Ready-to-Use Liquid Waterproofing Membrane, 15Kg, Used for Showers, Bathrooms and Wet Areas Under Tiles

Mapei Mapelastic Aquadefense Fust 15Kg is a single‑component, ready‑to‑use waterproofing membrane designed to protect structures from water leakage. It provides a flexible, elastic barrier that can resist light to moderate foot traffic and helps prevent root penetration in areas like planters. It can be used indoors and outdoors and is marketed as environmentally friendly since it does not contain toxic chemicals. The 15 kg pack is suitable for typical residential or small commercial projects.

Key features include a single‑component, ready‑to‑use formula, high elasticity and ductility, strong adhesion without priming, UV resistance, and good performance under varying weather conditions. It is designed to stop water leaks, withstand foot traffic, and resist root intrusion, making it suitable for bathrooms, balconies, terraces, and other wet areas.

It can be applied to common construction substrates such as concrete, cementitious renders, masonry, and plaster surfaces. For best results, ensure the substrate is clean, sound, dry, and free from laitance, oils, and loose particles.

One of the listed advantages is that it adheres well to substrates without the need for additional primers in many cases. However, surface preparation should follow the product’s guidelines: clean, dry, and dust‑free surfaces yield the best adhesion.

Prepare the substrate (clean, dry, and free from contaminants). Apply the waterproofing membrane evenly using a trowel or appropriate spreader to create an initial coat. Allow to set and then apply a second coat if required to reach the recommended thickness. Ensure the applied layer remains free of voids or holidays and has adequate cure conditions before tiling or finishing.

Cure times depend on ambient temperature and humidity. In normal conditions, the product reaches a usable state after a reasonable curing period and should be protected from rapid drying or wet conditions until it has adequately cured. It is best to wait until the membrane is fully cured before tiling or applying subsequent finishes.

Yes, it is described as environmentally friendly and non‑toxic. Nonetheless, when handling any construction product, use appropriate PPE (gloves, eye protection) and ensure good ventilation during application. Follow local safety guidelines and dispose of packaging according to local regulations.

It’s well suited for waterproofing bathrooms, showers, kitchens, balconies, terraces, basements, and outdoor surfaces that will be tiled. It also provides a barrier against water leaks in planters or areas exposed to moisture and humidity, thanks to its root‑penetration resistance and elasticity.

Mapelastic Aquadefense Fust 15Kg offers a single‑component, ready‑to‑use solution with strong adhesion, elasticity, and root resistance. For a shorter or lighter option, you might consider alternatives such as Mapelastic Aquadefense 6kg (smaller pack) or other compatible waterproofing membranes available on Fepy. Example comparisons include: Mapelastic Aquadefense 6kg: https://fepy.com/product/mapelastic-aquadefense-6kg and a larger/alternative option: https://fepy.com/product/mapelastic-aquadefense-25kg. Prices, coverage, and cure times vary by pack size and project requirements.

Start with a clean, dry, and sound substrate. Remove any dust, oils, or contaminants and repair any defects. Ensure ambient temperature is within the recommended range and avoid applying in excessively windy or wet conditions. Apply the membrane in uniform coats with even thickness and look for and fill any voids before finishing.

If you need to return the product, check the store’s standard return policy. Typically, unopened and undamaged packaging within the allowed return window is eligible for a refund or exchange. Contact the seller through the returns process to initiate the request and to obtain instructions on packaging and shipping.

Common issues include debris on the surface, moisture in the substrate, or applying in unsuitable temperatures. If adhesion seems poor, re‑clean the surface and ensure it is dry before reapplying. If curing is slow or erratic, verify environmental conditions and ensure proper ventilation and consistent temperature. Inadequate cure can also result from overly thick coats; apply in recommended thickness and allow proper curing time between coats.