What Is Caulking

Caulk serves as a crucial barrier between materials, ensuring your windows, bathrooms, kitchens, and more remain watertight and airtight. In this guide, we explore the multifaceted applications of caulking, from sealing cracks during painting or staining to blocking drafts, moisture, and pests. Learn everything you need to know about caulk types and their suitability for various indoor and outdoor projects.

Let's dive into the world of caulking and empower you to enhance the integrity and comfort of your living spaces.

Beginner Intermediate Advanced
10 min

Caulk is a substance that is used as a sealant and filler in construction and aims to prevent the penetration of water and air between two materials. Caulk can be used in your windows, bathrooms, kitchens and more, making your home water and airtight, increasing protection from wind, fire, heat and moisture. Caulks can also be used to seal cracks when painting or staining materials.

Drafts, bugs and runoff water can enter your home in gaps as small as 1/64 inch, about the size of a straight pin. Caulk can be used anywhere to seal gaps or form a bond between different types of building materials. It can save money on energy bills by blocking drafts. Plus, it can keep out water and pests. This guide will answer questions like “what is caulk?” and help you decide what type of caulk or sealant to use for various projects inside and outside your home.

Drafts, moisture and insects can enter your property through minuscule cracks that you might not even know are there! Caulk can be used anywhere to seal and bond together two materials and can help more than just to keep out wintery drafts! There are lots of different types of caulk and we are going to run you through them here.


Wet Area Silicone

Keep your wet areas mould-free with Selleys Wet Area Silicone, a superior waterproof and mould resistant seal that will not shrink, crack or peel away.

Silicone Remover

Remove old sealant quickly and easily with Selleys Silicone Remover. This powerful formula breaks down old sealant, making it easy to remove and to prepare surfaces.

Sugar Soap Original

Selleys Original Sugar Soap is perfect for cleaning walls and surfaces in your home. Keep your home looking fresh and new with our high-quality, effective cleaner.

How to Guides

How To Use a Caulking Gun

Learn how to use a caulking gun for a professional finish with Selleys step-by-step guide. Get tips & tricks to make the most of your sealant.

Top 5 Sugar Soap Hacks

Discover the top 5 sugar soap hacks with Selleys. Get surprising uses for this versatile product, from cleaning to DIY projects.

How To Fix Metal to Wood

Join metal and wood with ease using Selleys. Our guide will show you how to choose the right adhesive and bond metal to wood.