We do not recommend using Selleys No More Gaps or any similar gap sealant as a substitute for Tile Grout.
Selleys No More Gaps and Tile Grout each having distinct properties and uses.
Tile Grout: Most grout is a mixture of cement, water, and sand. It’s used to fill the spaces between tiles and keep them in place. There are various types of grout as well, each with distinctive properties and uses. Some other types include epoxy grout, acrylic grout, and urethane grout. Of these types of grout, epoxy is considered a top choice for tile projects for a number of reasons.
Selleys No More gaps is flexible and waterproof. It can be used in a variety of applications. In your bathroom it can used around the edge of a bathtub, where tiles meet the tub. It can also be used in corners or around the base of showers. It can also be used around drains and pipes to prevent leaks, or around doors and windows as a weatherproofing device.