Evostik Expanding Foam Filler from Bostik is a versatile solution for filling and sealing holes around window and door frames, or in brickwork, rendering, and plaster. It expands rapidly to fill the gaps and then hardens, allowing for easy trimming, cutting, and sanding. The 500ml size makes it convenient to use in a variety of applications. Once hardened, the foam can be painted to match the surrounding area.