Stelmax 1961 is a solvent-based gap filler specifically formulated for use with PVCu window and door installations. Supplied in a 300g cartridge, it fills gaps between frames and masonry, providing a smooth, paintable finish that blends with the surrounding surfaces.

Unlike standard caulks and fillers, the 1961 is designed to remain flexible after curing, accommodating the natural movement between different building materials without cracking or pulling away. It skins over quickly and can be overpainted once fully cured, making it a practical choice for finishing new-build and replacement window installations.

The white finish matches most PVCu frames straight out of the tube, reducing the need for additional decoration in many applications. It adheres well to PVCu, timber, brick, concrete, and plaster, making it a versatile option for window and door fitters looking for a reliable gap-filling solution.

Key Features:

• Purpose-made for PVCu window and door frame installations
• Remains flexible after curing to accommodate building movement
• Overpaintable once cured
• Adheres to PVCu, timber, brick, concrete, and plaster
• 300g cartridge for use with standard sealant guns
• White finish to match most PVCu frames