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Countertop Sealant: Step-by-step kitchen fixes

Need a countertop sealant to install a new sink in your kitchen? Is the sealant on your countertop yellow, mouldy or cracked? Find out how to seal a kitchen counter with our quick and easy guide.

How to seal a kitchen counter

Watertight sink and counter seals are vital to the health of your kitchen. Without a protective and durable seal, water can leak into the area underneath the sink or kitchen counter causing damage. Make sure you’re checking sealant regularly and be sure to replace it as soon as possible if you notice mould, cracks, peeling or discolouration.

Whether you need to install a new sink or replace old sealant, the process is the same. Here’s how:

  1. Put on some gloves and ensure your working area is well-ventilated.
  2. Check that the surfaces you’re working with are clean, dry and free of grease, dust, or other contaminants. This will ensure a strong adherence between the kitchen countertop sealant and the surface being sealed. If you’re replacing old sealant, make sure you completely remove all residue before proceeding.
  3. Remove the sealant’s cap and puncture the seal.
  4. Attach the nozzle and snip it to your desired bead size.
  5. Apply the sealant with steady pressure at a 45-degree angle to achieve a smooth seal.
  6. Tool within 5 minutes using your finger or a damp towel.
  7. Clean any residue immediately with mineral spirits.
  8. Allow to fully dry before use.

Remember - paint doesn’t stick to silicone sealants, so make sure you paint the surface before.

Using Granite countertop sealants

Granite countertops are a stunning choice for kitchens. Not only are they beautiful, but they’re also tough and durable and don’t scratch easily, making them practical for the kitchen space. Luckily, the steps for sealing around granite countertops are the same as we’ve outlined above.

However, there are a few things you need to keep in mind when selecting a granite countertop sealant. Make sure the countertop sealant is natural stone compatible - to avoid staining the granite - and that the sealant matches the colour of the granite. Granite countertops are often darker in colour than most sealants, making clear silicone sealants the best match.

Finding a countertop sealant for the job

Sealing a sink to a countertop can be no fuss with the right sealant and Loctite Clear Silicone Waterproof Sealant is a great choice. This multipurpose waterproof sealant doesn’t crack, peel or shrink, making it perfect for kitchen surfaces like metal, steel, cultured marble, granite, tile, ceramic, and porcelain.

For kitchen countertop sealant repairs, try Loctite Re-New. There’s no need to remove the existing sealant - this star product is easily applied over existing joins, effectively covering discolourations and cracks. Sealants as good as new in just one step!