Buy silicone sealant
Silicone sealant is an elastic sealant that is used for waterproofing cracks and seams. Its elasticity makes it widely applicable, such as sealing concrete and masonry, connecting joints in wet areas, glazing systems, kitchens, bathrooms, showers and industrial applications. Check carefully whether the silicone sealant is suitable for what you want to use it. This is described in detail in the products themselves.
We supply silicone sealant in tubes or sausages. The tubes fit in a normal caulking gun. For a sausage you need a special caulking gun that is often only used by the professionals.
Advise: Silicone sealant is not paintable, so always choose a sealant in the right color or a neutral / transparent sealant.