Haymes Prepcoat Ultraseal is a water‑based acrylic sealer and undercoat primer that helps you prepare surfaces quickly and effectively before you apply topcoat paint. First, it seals new plasterboard, masonry, timber and other porous substrates. Then, it creates a reliable base that improves adhesion and enhances finish performance. Because it’s designed for both interior and exterior use, you can use it on walls, ceilings and trims across many projects.

Key Features & Benefits

• Seals and primes in one step — prepares porous surfaces for a smoother paint finish.

• Water‑based and low odour — easy to work with and gentle on indoor air quality.

• Fast drying — touch dry in ~20 minutes so you can recoat sooner.

• Great coverage — delivers up to ~16 m² per litre, depending on surface texture.

• Easy to sand — helps you achieve a smooth base before topcoating.

• Works with water or oil paints — flexibly under both paint types.

How to Use

First, make sure the surface is clean and dry. Then, apply Ultraseal evenly with a brush, roller or spray. Next, allow it to dry before adding your chosen Dulux or Haymes topcoat. Finally, see improved paint adhesion and a more uniform finish on broad wall areas.

Whether you’re sealing plasterboard or priming exterior masonry, Prepcoat Ultraseal gives you a strong foundation for long‑lasting paint results with minimal fuss.