The Prestonett Waterproof Masonry Filler in grey is a durable and reliable solution for both interior and exterior wall repairs. With a pack size of 4 x 5kg, this filler is perfect for various DIY projects around the home. Its waterproof properties make it ideal for use in damp environments, ensuring a long-lasting and effective repair job. Whether you're filling in cracks or holes in your walls, this masonry filler is a practical and efficient choice for achieving a professional finish.