Kelmore MegaFlex Standard S2 Adhesive White 20kg EMC Tiles Kelmore Megaflex Standard S2 White Ark Tiles Tile Adhesives for Walls and Floors Tileflair Tile Adhesives for Walls and Floors Tileflair. Experience the ultimate in tiling with Kelmore's MegaFlex Rapid S2 adhesive. With its highly polymer modified formula, this adhesive provides excellent bond strength and flexibility for a wide range of tiles on various backgrounds. Perfect for underfloor heating and wet areas, MegaFlex Rapid S2 sets quickly and is ready for grouting in just 3 hours!