Name: Mapei Mapeflex PU S25 Grey 600ML
Brand: Fepy
SKU: 40389-NOS
Price: 22.17 AED
Availability: InStock

Question 1

What is Mapei Mapeflex PU S25 Grey 600ML and what is it used for?

Accepted Answer

Mapei Mapeflex PU S25 Grey 600ML is a professional-grade polyurethane sealant designed to create watertight, flexible seals in construction joints. It provides high strength and elasticity, making it suitable for joints that experience movement, temperature changes, and exposure to the elements. The 600 ml cartridge delivers a ready-to-use, grey sealant with stain-resistant properties for durable sealing in building projects.

Question 2

Which surfaces can Mapeflex PU S25 be applied to?

Accepted Answer

Mapeflex PU S25 can be applied to a wide range of common construction substrates such as concrete, brick, masonry, plaster, stone, metal, tile, glass, and timber, provided the surfaces are clean, dry, and free of dust, grease, and loose parts. Always perform a small test to confirm adhesion on the specific substrate.

Question 3

How does Mapeflex PU S25 perform when joints move or the surface expands and contracts?

Accepted Answer

Mapeflex PU S25 is designed to be elastic and highly resistant to movement. It maintains a strong bond and seals effectively even with minor surface movement, making it well-suited for expansion joints and joints exposed to thermal cycling and structural movements.

Question 4

What are the key specifications of Mapeflex PU S25 Grey 600ml?

Accepted Answer

Key specs: color is grey, cartridge size is 600 ml, one-component polyurethane sealant, high elasticity and durability, stain-absorption properties to act as a protective barrier, and a simple application profile that requires no special tools beyond a standard caulking gun.

Question 5

How do I apply Mapeflex PU S25 Grey 600ml step by step?

Accepted Answer

1) Clean and dry the joint area. 2) Cut the nozzle to the desired bead size and load the cartridge into a caulking gun. 3) Apply a steady, continuous bead along the joint. 4) Tool the sealant with a wet finger or appropriate tooling tool to achieve a smooth finish. 5) Remove excess material and allow it to cure in a well-ventilated area. Avoid applying on frozen surfaces or when temperatures are outside recommended ranges.

Question 6

Do I need a primer before applying Mapeflex PU S25?

Accepted Answer

In many cases Mapeflex PU S25 can be applied directly to clean, dry substrates without a primer. However, substrate compatibility can vary by material and condition. Always test adhesion on the specific substrate and follow the product’s guidelines for priming if required.

Question 7

How should I tool and finish the sealant after application?

Accepted Answer

Tool the sealant soon after application to ensure a uniform, smooth finish. Use a damp tool or finger to press the sealant into the joint and achieve crisp edges. Remove any excess material promptly to prevent staining or uneven surfaces.

Question 8

What safety measures should I take when using Mapeflex PU S25?

Accepted Answer

Use PPE such as gloves and eye protection in a well-ventilated area. Avoid skin or eye contact and avoid inhaling fumes. Keep away from sources of ignition before curing. Follow the safety data sheet and product instructions for storage and handling.

Question 9

How does Mapeflex PU S25 Grey compare to other polyurethane sealants on Fepy?

Accepted Answer

Mapeflex PU S25 offers strong adhesion, high elasticity, and durability suitable for joints that move. It is designed for exterior and interior use with good resistance to weathering. For a direct contrast on Fepy, you can compare it with Mapeflex PU S25 Beige 600ml, which shares the same formulation in a different color: https://fepy.com/product/mapei-mapeflex-pu-s25-beige-600ml

Question 10

How does Mapeflex PU S25 compare with silicone sealants in terms of adhesion and movement?

Accepted Answer

Polyurethane sealants like Mapeflex PU S25 generally offer superior adhesion to a wider range of substrates and higher elasticity for joints that experience movement, compared with many silicone sealants. This makes PU S25 a strong choice for exterior joints and substrates prone to movement, though silicone can be preferable for certain non-porous surfaces and for glazing applications.

Question 11

What makes Mapeflex PU S25 Grey a good value for my project?

Accepted Answer

Mapeflex PU S25 Grey combines strong adhesion, excellent elasticity, durability, and stain resistance in a single-component sealant. Its 600 ml cartridge provides substantial coverage for continuous joints, reducing the need for frequent re-sealing and offering long-term protection for occupied or exposed building joints.

Question 12

What do I get with the 600 ml Mapeflex PU S25 Grey cartridge and how should I store it after opening?

Accepted Answer

The 600 ml cartridge includes the polyurethane sealant ready for immediate use with a standard caulking gun. After opening, reseal promptly with its cap or nozzle to prevent skin formation. Store in a cool, dry place away from heat and direct sun, following the product’s shelf-life guidance.

Mapei Mapeflex PU S25 Grey 600ML

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