Polycell Polyfilla Mendall 90 Adhesive Filler 500 g overview

Polycell Polyfilla Mendall 90 Adhesive Filler delivers flexible, weather‑resistant crack and hole repairs across interior and exterior surfaces. As a resin‑bound, ready‑mixed paste, it adheres strongly to porous and non‑porous substrates, then dries without shrinkage to form a smooth, tough finish that accepts paint and withstands everyday movement.

Polycell Polyfilla Mendall 90 Adhesive Filler 500 g benefits and features

• Versatile substrate coverage: Repairs plaster, wood, brick, stone, concrete, stucco, metal, glass, fibre‑cement with consistent adhesion.
• Flexible movement tolerance: Copes with normal expansion and contraction, helping prevent repeat cracking.
• Weather resistant design: Suitable for exterior use when overcoated as recommended.
• Ready‑to‑use format: Pre‑mixed paste saves time and reduces application errors.
• Slump resistance: Holds form in thicker applications for clean profile control.
• Fast drying: Thin layers dry in ±1 hour; thicker up to 10 mm can take ±24 hours depending on conditions.
• Reliable overcoating window: Accepts overcoats after ±2 hours at 23 °C, enabling efficient project sequencing.
• No shrink finish: Achieves a durable, abrasion‑resistant repair that maintains flush lines.
• Wet‑knife smoothing: Levels cleanly while wet; if needed, wet sand with 100‑grit waterproof paper.

Steps to follow for applying the Polycell Polyfilla Mendall 90 Adhesive Filler 500 g

Preparation

1. Clear dust, grease, and surface contaminants; ensure sound substrate.
2. Open cracks to a “V” profile so the filler beds firmly and locks into place.
3. Spot prime nails and exposed metal with appropriate primers where required.
4. Prime cracks before and after filling with Plascon Plaster Primer, then allow to dry as instructed.

How to apply the Polycell Polyfilla Mendall 90 Adhesive Filler 500 g

1. Mix thoroughly in the tub for uniform consistency.
2. Using a putty knife, apply in smooth layers up to 5 mm thick per pass.
3. Strike off and finish with a wet knife to achieve a flush, paint‑ready surface.
4. Allow thin layers to dry for ±1 hour; for thicker fills up to 10 mm, extend drying to ±24 hours depending on temperature and humidity.
5. After ±2 hours at 23 °C, proceed with overcoating as required.

Cleanup

• Wash tools with clean water immediately after use.
• If sanding is necessary, wet sand using 100‑grit waterproof paper to refine the finish.
• Dispose of residues responsibly; avoid rinsing large quantities into drains.

A few scenarios where the product can be used

• Stabilising recurring hairline cracks at cornice‑to‑wall joints.
• Replacing failed glazing putty around windowpanes.
• Stopping small gaps in timber floors and fascia boards before painting.
• Repairing exterior masonry blemishes ahead of priming and topcoating.
• Addressing adhesion‑challenged joins where typical fillers fall out.

Other products you might like for your repair and refinishing workflow

• Polycell Products
• Cleaning Products
• Hardware

Health and safety

Always ensure adequate ventilation during application and drying, and avoid inhaling dust when sanding. Keep out of reach of children and prevent contact with eyes; rinse with plenty of water and seek medical attention if irritation persists. In case of skin contact, wash with soap and water. Because repairs can be affected by moisture, protect the area from water ingress while drying, then avoid permanently wet exposure. When using primers and overcoats, follow manufacturer guidance for curing times, coverage, and compatibility to maintain a safe, reliable finish.

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