How to Seal Caulk Between Tiles

Tile jobs are not finished until the caulk/grout between the tiles is sealed. The type of caulk/grout plays a huge role in the ability to seal it. If the space referred to is the shower and tub surround, then the substance between the tiles is sealable. However, if the caulk is made of 100% silicone, it won’t take any other liquid applied to it because silicone is a sealer. This also applies to the backsplash in the kitchen. One issue concerning caulk/grout sealing between tiles is the removal of any mildew that may be present. If the grout/caulk is stained by mildew, the best course of action is to remove the old caulk/grout and replace it.

Difficulty: Moderate

Instructions

Things You'll Need:

• Bucket
• Water
• Non-abrasive spray mildew cleanser
• Sponge
• Grout sealer
• Brush
• Soft clean cloth

1. Fill the bucket half full of water. Spray the non-abrasive cleanser on the area where the sealer is needed. Allow it to soak the area for a minute or two. Scrub the area with the sponge, wringing it often.

2. Rinse the cleanser off completely and let it dry. If the caulk/grout is new, it must be cured thoroughly before applying sealer. This is usually about two weeks.

3. Apply the sealer with a brush. If the tile is glazed, the sealer will be easy to remove from the tile, but excess should be cleaned off as quickly as possible.

4. Apply the sealer only to the caulk/grout on tiles without a glazed finish. Clean the excess sealer from the tile quickly with a dry soft and clean cloth.

Tips & Warnings

• Always wear safety glasses when working with cleaners and sealers.
• Wear protective gloves.
• Do not apply more sealer than what can be cleaned off before it dries.
• If special application is needed, the manufacturer’s instructions will point this out.
• Remove excess sealer as quickly as possible as it dries quickly and forms a haze on unprotected tile.
• Tool caulk/grout quickly if replacing by running a wet finger along the caulk/grout line.
• Do not allow sealer to have prolonged contact with skin as it is an irritant and can result in a rash.